I got one of these a few days ago, I'd give it a 7/10 score so far. I'd consider myself a fairly hardcore gamer type, and that's my main criteria for judgment.
The monitor is nice but it really took some getting used to, and I'm still on that learning curve. The initial issue was simply setting up the contrast and brightness. The monitor is insanely bright and I have both these settings at zero in the OSD. I'm also still trying to find the sweet spot on the ATI gamma slider.
I have no tearing or smearing in CS:S, KotORII, or Pacific Fighters. One of my biggest problems is that I'm very fidgety while I'm gaming. Sometimes I lean back in my chair and that really changes the color coming from the monitor. I was kinda surprised by this but I'm slowly getting used to it. I'm trying to sit straight up now and view the screen from an upright position.
My two biggest issues with the monitor, at this point, are the nag display change OSD screen. Any time an in-game movie in KotORII plays the screen res changes and thus displays a big blue box on the screen. The second issue is color recognition in a 3D application (probably due to the 500:1 contrast ratio). Everything close up looks properly colored, no banding, etc.. Everything in the distance turns into mud though and I have a hard time getting a proper ID on distant movement in CS:S. I'm still tweaking contrast, brightness, and gamma though so maybe I'll find a solution.
Anyway... if this is the current state of LCD monitors I think they're not quite ready for competitive gaming yet. But when I look at the form factor and power consumption difference the LCD becomes very attractive to me, and possibly worth it. I'm not sure yet if I'll return to the CRT, probably not though. I may try another LCD brand though.