I have an LG34UM94P (3440x1440) and it's awesome for my content creation, loads of desktop real-estate and with a 24" side monitor for pallets and clutter windows (render options, etc) it's even better. I have it hooked up to my game rig too but i'm noticing that full screen refresh on it (so in 3rd, 1st person games and scrolling across landscapes in RTS) is tiring to look at for long periods (2-3+ Hrs). Even with 2 970's driving it there was tearing in a lot of games and when i used adaptive sync i noticed the micro stutter a lot. It's the main reason i'm looking at getting a high refresh rate monitor for gaming and just use the LG for content.
I'd agree with Lynx too, WoW at 3440x1440 on the LG is pretty sweet. It would be sweeter if i could get WoW to run more smoothly. That's a topic for another thread tho.