There is a draft report looking at the temporal and luminance characteristics of the Samsung 2233Rz 120Hz 3D gaming monitor:
http://www.activestim.com/downloads.php#lcd
Note, according to Samsung support, 120Hz mode is not yet compatible with OS X.
Until now, LCD monitors have not been used widely for research in vision. Despite their main advantages of continuous illumination and low electromagnetic emission, these monitors had problems with timing and reliability. Here we report that these problems are largely over with at least one new inexpensive 120 Hz model, whose timing and stability is on a par with a benchmark CRT monitor, or even better. The onset time was stable across repetitions, 95% confidence interval (the error) of which was <0.01 ms. Brightness was also delivered reliably across repeated presentations (<0.04% error) and across blocks with different durations (<3% error). The LCD monitor seems suitable for many applications in vision research, including the studies that require combined accuracy of timing and intensity of visual stimulation.