I just recently bought an Asus VG248QE after my Viewsonic stopped working correctly and the first thing I tried was getting lightboost running. I was expecting a lot since plenty of people hyped it up even more so than 120hz but so far it doesn't seem that great.
In my opinion the step up from 60Hz to 120Hz is orders of magnitude greater than 120Hz to lightboost. The difference is definitely noticeable but it isn't as much as 120hz. Stepping up to 120hz literally made my eyes feel weird for the first day or two.
I've used a CRT for a week @ 120Hz and that was a clear experience but I can't really remember well enough to compare to lightboost on an LCD.
One of the bigger downsides to Lightboost is that I can't adjust my color settings in game which leaves a very noticeable purple/blue hue on everything.
Anyone else who has used/uses Lightboost have any thoughts?