Won't that wide resolution be weird for playing games on it?
No, it's actually pretty cool. It also depends on how far away you are from the monitor.
Games are usually more immersive in 21:9. There's more peripheral vision. If you have an Nvidia card, you can set a custom resolution of 1920x810 to test it out. It's pretty much the same thing, but the resolution is obviously lower and the picture is smaller because the monitor isn't designed to display a 21:9 image.
I've been eyeing that monitor myself. I'm really interested in 2560x1080 monitors, but unfortunately I already spent a boatload on the rest of my system, so it'll have to wait. Hopefully those monitors are still around a few years from now. Unfortunately, they're not very popular.