I have 34um67 , so far I love it . a lot of space on screen !
First time you play a game on it you'll feel weird due to more pereferal space. Games look gorgeous especially fps games and sims like arma 3 and dayz sa.
Some games like skyrim and fallout will require some tweaking since they don't support 21:9 field of view, to solve these problems go to flawlesswidescreen.org and download the program.