Honestly, the picture quality of these monitors is HORRIBLE! For the money, you're FAR better off getting a Dell U2312HM, U2412HM, or similar. 120hz is not worth the horrific picture quality, especially when you enable their "gaming modes"; all it does is make the entire image look blown-out, which sure might help you the half-dozen times you'll ever be completely dependent upon your ability to see in the dark with a monitor....but for the other 99.99999999% of the time, you'll get a picture with a washed-out gamut.
Oh, and input lag on this is incredibly mediocre, in fact it's WORSE THAN my U2312HM eIPS monitor! It's also worse than the U2713HM, and about the same as the U2713H that I just got.
Using my trusty P1230 UltraScan 22" CRT (2048x1536 @ 95hz) and a high-speed camera (shoots 2560x1440p 24bit @ 960fps, 2560x1440p 36bit/48bit @ 480fps, 1920x1080 48bit @ 1200fps! I used the 1080p 48bit-color 1200fps shooting mode) hooked up directly to an external HDD Enclosure (up to 8xHDD's) with a pair of WD10EZEX 1TB Single-Platter HDD's in RAID0 (328MB/sec avg speed, 12.2ms avg Seek).
*I do monitor reviews for a number of review sites*
The BenQ has ~11.9ms MINIMUM INPUT LAG and 48ms MAXIMUM, with the average coming in at around 23.5ms!!!
The U2312HM, on the other hand, averages about 3.5ms!!!
(One Frame at 60FPS = 16.67ms, while One Frame at 120FPS/HZ = 8.34ms)
Therefore, it will take anywhere from 2-6 frames for your input to register with the BenQ, but with the Dell it will register immediately on the next frame (82.5% of the time)...