I have had a Samsung HLN507W for about 6 months, so far so good. I really like the picture on it, and the colors are very adjustable.
Negatives-
1) it has a bulb that needs replacement every few years ~$250
2) I've noticed it occasionally has difficulty with picture when you first turn it on. The sound goes on immediately, and then the picture takes about 10 seconds to come in normally. About one in four or five times that you turn it on, no picture has come in after 30 seconds, and the set turns itself off and then back on. It hasn't had to do this twice so far.
Other than that I'm very happy with the set.