Hey guys. I have more money than common sense, so I actually have both of these monitors right now (using the system in my Sig):
The LG 34" (34UM95-P)
and
The Asus PG278Q 27"
What happened was....
I had been using a Dell Ultrasharp 27" (u2711) and wanted to try something different, so I picked up the LG 34"
The LG shows up, and WOW I thought, this thing is HUGE. And buy Huge, I mean AWESOME. Not huge like thick and heavy. Huge like the view screen on the Starship Enterprise kind of huge.
Time to fire it up!
Initially I was a bit disappointed a the colors being too dark on 100% brightness after coming from my high end Dell, but I was awed by the amount of screen real estate. You almost have to physically turn your head a few degrees to see the far edges of the screen. Looks amazing sitting there too. Moving files around the Windows environment, web browsing in once browser while having a song or video playing in another (open at the same time of course), etc. You pretty much NEVER have to resize a file or web browser explorer window to make room to see everything at the same time. Stuff like that was WAAAAY improved over my Dell 2711.
Game wise, I'm a light-medium gamer. The first title I fired up on the LG was WarThunder (which supports 3440 x 1440 with no problems). "WOW this looks nice." You can simply see more stuff (ie, distance) laterally. I was getting the full 60fps (v-sync on) on the LG as I was with the Dell; the Titan Im using handled the slightly tougher task of rendering the higher resolution of the LG fine. Also played around in Guild Wars 2 (full 3440 x 1440 support) and Heroes and Generals (which has a slight glitch at 3440 x 1440) and was really impressed at how much "more" I could see in these games vs on my 27" Dell at 2560 x 1440.
Fast forward a few months, and I figured I'd see what this whole "g-sync fad" is about and I just got the PG278Q today.
First impression taking it out of the box was...
"WTF, they accidently packed the 24" version in the box for the 27!!!" (Obviously they didn't.) I was just so used to the 34" LG "wide" widescreen that going back to a normal aspect ratio 27" feels fucking tiny. I literally had to get my tape measure out and measure the screen size diagonally to convince myself that I was not somehow duped into buying a 24" monitor.
Fired it up today, and the colors feel too bright everywhere, but I think this is a result of using the darker LG for a few months. Immediately miss the lateral real estate advantage of the LG when web browsing multiple browsers / windows, moving pics around, etc at the same time. Time to game. Just like the first game I fired up when going from the Dell to the LG was WarThunder, so it shall be again. Enabled g-sync everywhere, set the monitor to 144hz in the control panel, and fired up WarThunder. Disabled v-sync in game, of course, and had to change resolution DOWN to 2560 x 1440
First thoughts, WOW this IS smooth. I now see this whole "smoothness" thing that g-sync fans are talking about. FPS counter in game is showing stable at 144 nearly all the time. Aircraft animation and just panning around the scenery in game definitely feel smother.
Fire up Heroes and Generals. Same feeling. Wow this IS smooth. I never felt like me Dell or LG was "rough" (ie, the opposite of smooth). I generally got a steady 60fps in any game I played with mostly high settings when using the Titan and DP cable with the Dell and the LG (note, you have to use the DP connection to get 60hz with the LG. If you use HDMI, it is limited to 50hz!). But panning and running around at 144 fps on this Asus is definitely smoother.
I'm tired of typing so a summary of first impressions after now owning both of these beasts.
LG 34" 21:9
+Amazing lateral screen real estate is great for the Windows 8 desktop environment / productivity
+When the game has full support of this resolution, which most modern games do, the amount of extra "space" you can see laterally really is very very very nice.
+I can see why several online reviewers who received the LG as a review sample said after a few hours of use, it literally became their favorite monitor and did not want to put anything else on their desk.
-Colors felt slightly too dark (at max brightness) coming from my high quality Dell
-G-sync tech definitely has a detectable advantage in games, especially the hard-core FPS games that are populated with 13 year olds on Ritalin (BF4, BF3, CoD's, etc)
-Non adjustable stand (height wise) but the height was perfect for my desk / chair anyway
Asus PG278Q 27"
+Yes, games are definitely smoother when paired with a high end video card (again, Im using an overclocked Titan)
+In first person shooters, this is where you notice this new tech the most.
-The screen literally feels TINY after using the LG for only a few months. Going from the "wide" widescreen of 34" @ 21:9 to a "normal" wide screen of 27" feels like I literally went back to a 19" 1080p from years ago.
Pic related, the 2 x monitors side by side. I don't have an HDMI cable to connect the LG to show you side by side with both powered on and in a desktop:

To me, there is NO winner here. The LG 34" way out classes the Asus in the windows operating environment as well as in games like GuildWars 2, WarGame Red Dragon, etc. Ie games where seeing "more" of the environment is a bigger help than instant mouse response time. The Asus 27" loses badly in the windows operating environment but when you fire up BF4 for the first time on it (as long as you are paired up with a GTX 780 or above), you will say "OHHH, this IS smooth..." and maybe get a few extra head shots that you wouldn't have before.
After using both of these screens for Win 8 general use and light-medium gaming, the real winner would be the LG 34" 21:9 with a 144hz panel paired up with G-Sync. A monitor like that will be my next purchase.
There simply isn't a winner (to me) between these two screens, so I'm not sure yet which one is going on E-Bay...
The LG 34" (34UM95-P)
and
The Asus PG278Q 27"
What happened was....
I had been using a Dell Ultrasharp 27" (u2711) and wanted to try something different, so I picked up the LG 34"
The LG shows up, and WOW I thought, this thing is HUGE. And buy Huge, I mean AWESOME. Not huge like thick and heavy. Huge like the view screen on the Starship Enterprise kind of huge.
Time to fire it up!
Initially I was a bit disappointed a the colors being too dark on 100% brightness after coming from my high end Dell, but I was awed by the amount of screen real estate. You almost have to physically turn your head a few degrees to see the far edges of the screen. Looks amazing sitting there too. Moving files around the Windows environment, web browsing in once browser while having a song or video playing in another (open at the same time of course), etc. You pretty much NEVER have to resize a file or web browser explorer window to make room to see everything at the same time. Stuff like that was WAAAAY improved over my Dell 2711.
Game wise, I'm a light-medium gamer. The first title I fired up on the LG was WarThunder (which supports 3440 x 1440 with no problems). "WOW this looks nice." You can simply see more stuff (ie, distance) laterally. I was getting the full 60fps (v-sync on) on the LG as I was with the Dell; the Titan Im using handled the slightly tougher task of rendering the higher resolution of the LG fine. Also played around in Guild Wars 2 (full 3440 x 1440 support) and Heroes and Generals (which has a slight glitch at 3440 x 1440) and was really impressed at how much "more" I could see in these games vs on my 27" Dell at 2560 x 1440.
Fast forward a few months, and I figured I'd see what this whole "g-sync fad" is about and I just got the PG278Q today.
First impression taking it out of the box was...
"WTF, they accidently packed the 24" version in the box for the 27!!!" (Obviously they didn't.) I was just so used to the 34" LG "wide" widescreen that going back to a normal aspect ratio 27" feels fucking tiny. I literally had to get my tape measure out and measure the screen size diagonally to convince myself that I was not somehow duped into buying a 24" monitor.
Fired it up today, and the colors feel too bright everywhere, but I think this is a result of using the darker LG for a few months. Immediately miss the lateral real estate advantage of the LG when web browsing multiple browsers / windows, moving pics around, etc at the same time. Time to game. Just like the first game I fired up when going from the Dell to the LG was WarThunder, so it shall be again. Enabled g-sync everywhere, set the monitor to 144hz in the control panel, and fired up WarThunder. Disabled v-sync in game, of course, and had to change resolution DOWN to 2560 x 1440
First thoughts, WOW this IS smooth. I now see this whole "smoothness" thing that g-sync fans are talking about. FPS counter in game is showing stable at 144 nearly all the time. Aircraft animation and just panning around the scenery in game definitely feel smother.
Fire up Heroes and Generals. Same feeling. Wow this IS smooth. I never felt like me Dell or LG was "rough" (ie, the opposite of smooth). I generally got a steady 60fps in any game I played with mostly high settings when using the Titan and DP cable with the Dell and the LG (note, you have to use the DP connection to get 60hz with the LG. If you use HDMI, it is limited to 50hz!). But panning and running around at 144 fps on this Asus is definitely smoother.
I'm tired of typing so a summary of first impressions after now owning both of these beasts.
LG 34" 21:9
+Amazing lateral screen real estate is great for the Windows 8 desktop environment / productivity
+When the game has full support of this resolution, which most modern games do, the amount of extra "space" you can see laterally really is very very very nice.
+I can see why several online reviewers who received the LG as a review sample said after a few hours of use, it literally became their favorite monitor and did not want to put anything else on their desk.
-Colors felt slightly too dark (at max brightness) coming from my high quality Dell
-G-sync tech definitely has a detectable advantage in games, especially the hard-core FPS games that are populated with 13 year olds on Ritalin (BF4, BF3, CoD's, etc)
-Non adjustable stand (height wise) but the height was perfect for my desk / chair anyway
Asus PG278Q 27"
+Yes, games are definitely smoother when paired with a high end video card (again, Im using an overclocked Titan)
+In first person shooters, this is where you notice this new tech the most.
-The screen literally feels TINY after using the LG for only a few months. Going from the "wide" widescreen of 34" @ 21:9 to a "normal" wide screen of 27" feels like I literally went back to a 19" 1080p from years ago.
Pic related, the 2 x monitors side by side. I don't have an HDMI cable to connect the LG to show you side by side with both powered on and in a desktop:

To me, there is NO winner here. The LG 34" way out classes the Asus in the windows operating environment as well as in games like GuildWars 2, WarGame Red Dragon, etc. Ie games where seeing "more" of the environment is a bigger help than instant mouse response time. The Asus 27" loses badly in the windows operating environment but when you fire up BF4 for the first time on it (as long as you are paired up with a GTX 780 or above), you will say "OHHH, this IS smooth..." and maybe get a few extra head shots that you wouldn't have before.
After using both of these screens for Win 8 general use and light-medium gaming, the real winner would be the LG 34" 21:9 with a 144hz panel paired up with G-Sync. A monitor like that will be my next purchase.
There simply isn't a winner (to me) between these two screens, so I'm not sure yet which one is going on E-Bay...