I've probably tried it on at least 5 different monitors, all LCD. I always end up disabling it because it looks awful to me. I've tried messing around with the ClearType tuner and such and made it slightly more tolerable (slight color fringes instead of looking like thousands of pixies barfed rainbows all over my text). The concept is nice... if you see in black and white. In practice, you end up with subpixel rendering of text that hides all but one of the red pixels or similar situations, so you just see edges of color all over the place. What drives me nuts is that some applications, such as Outlook, seem to FORCE ClearType to be enabled no matter what. Makes reading emails painful.