I bought one of these babies last week and have been playing Battlefield 3 the past weekend.
For me there is no noticeable input lag what so ever.
The screen looks amazing and has very good image quality.
I bought an ATI 7950 to be able to play my games at native resolution and overclocked it to 1025 core and 1575 memory (no volt mods yet).
BF3 at Ultra plays at an avg of 45-50 fps and looks awesome on a screen like this.
There are two things I personally thought could have been done a little neater on the build of the monitor.
When I look at the bezel I can see that the bezel is tightly fastened in the corners but in the middle of the screens bezel - both top bottom and sides - you can see it be looser.
The second thing is that the real image of the screen doesn't touch the bezel, but has a slight black edge from the panel visible before you come to the bezel.
I don't mind this, but it is not really centered properly as the left side has a thicker line then the right side.
Now I can be a bit of a neurotic idiot when it comes to things like this, but was wondering if others have this as well.
I also am not able to see any flickering from the PWM and run it at 27 brightness.
As a gamer this is to my opinion the best of the screens currently available for a good price.