It is pretty bad for my unit. I don't know about others. It may happen anywhere in your screen there. Yes, it does show up in darker room for some angles.
I don't know. Maybe you are in the group of people who can stand such anti glare. I am working in my school Computer Lab. Man, all the Dell monitors' coating are extremely grainy, and those monitors are killing my eyes. I hate to work with them. :mad:
How about this http://www.amazon.com/MX279H-27-Inch-Screen-LED-Lit-Monitor/dp/B00B17C5KO/ref=sr_1_4?ie=UTF8&qid=1369738601&sr=8-4&keywords=asus+monitor+27%22
Idk about this, but I have heard nothing but problems with 21:9 monitors at the moment for both Dell and LG. if I were you I would wait until new models roll out and new manufactures enter the market.
Personally, I won't choose Dell's monitor since the coating layer is very annoying. It makes the screen look extremely grainy. Did you check out Eizo Foris FS2333 yet? It is one of the very first ISP monitor with fairy low input lag you can use it either for gaming and photo editing. Moreover...