I play my 360 on a 19" Samsung. I forget the model #, but its fairly new (less than 1yr old) its the one with the 2ms response time, so theres no 'ghosting' effect from quick lateral movements.
It looks awesome, I have no problems with picture quality. My only gripe is that the games, as good as they look, just arent that immersive on a 19" screen. But thats not my monitors fault, its my fault for not buying a larger monitor! lol