Its easily the Smart Release feature. I can't tell you how many times I have had to bleed myself on a case because of its horrid front panel and/or drive cage designs.
I think one of the coolest feature is the placement of the side 25cm fan does not interfere with large CPU heatsinks. Combine that with the incredible airflow in the mesh design, dust filters and cutouts for cable management and you have a serious case here.
Looks like it has good air filtration, and the grill on top is a nice feature, it has airflow while at the same time making it harder for dust to get in when the system is off.
I like whole case actually but I've always had cases that didn't have a cpu cutout for help with cooling the cpu and the cable management. As a result I've always had a hard time making the cables in my cases look good.
You know what would be the most awesome thing about owning this case? So I don't have to deal with this from years off abuse and random people who make parts disappear off my case. I would also love that doors just could stay on their own again. A hard drive rack would also be nice. Hell since my front door busted on my case I would love a case without a front door too. Oh and dust filters are awesome if someone did not steal them out of this case for a mod. A new case would also allow me to get a full sized motherboard since my last standoff seem to have gone AWOL causing me get a micro ATX board.
I like the absolutely enormous 25 cm fan on the side panel. I think sometimes cases go a bit sideways in trying to make a case quiet by restricting airflow when sometimes the best solution is to open everything up and use massive, slow spinning fans to move a lot of air through a case.
I like the cable management features, The cutouts for the Heat sink brackets are a great feature. Also the modular HDD bays are awesome. Overall looks like a really well built case.