I've had the Samsung HL-S4676S 46" DLP for a little over a week now.
The Good:
Black levels are quite good in my opinion. Black is black. The colors are vibrant. You can tell the difference between various hues of purple and blue, for example. I sit about 15' back, but even at much closer viewing distances, I'm not seeing any annoying pixelation or dithering noise, etc... I watch a lot of basketball, and this set has none of the annoying motion blur or pixelation that I've noticed on many LCD screens. Sports in HD are incredibly crisp, and the NFL playoff games looked fantastic last weekend. Too bad the Chargers lost though! I have Dish Network HD with the VIP622 DVR.
Sometimes SD programming looks surprisingly good, but if the signal on a particular station is low quality, you will definitely notice. SD is better than I thought it was going to be overall though. The menu system is pretty easy to use on this tv, and it offers enough adjustments for my liking. I've had little need for the owner's manual as of yet.
I really like the styling of this tv too. Screen glare is not a problem at all. The thin bezel and curved rear of the set look very good, it fits nicely in a corner, and it weighs under 50 lbs. And it's solid black, which matches my speakers, speaker stands and tv stand. The Sony rptv LCD looks clunky by comparison (IMHO).
The Bad:
I see rainbows when I glance away from the screen or blink sometimes. They're most noticeable during dark or black & white scenes. At first I was freaked out by it and thought of returning the tv, but I'll probably just learn to live with it. I think I'd rather have this problem than the motion blur/pixelation of LCD. I just don't see anything else on the market that I'd like to replace this set with at the moment. With the amount of news and sports that I watch, I'd surely get burn in problems with a plasma. 46" is perfect for my room, whereas 42" is too small and 50" is too big. I figure I'll enjoy this set for a few years, then I'll invest in an LCD with 1080p and 120 Hz backlighting, or whatever is the best I can afford at the time. In any event, the Samsung DLP is a tremendous step up from the $250 25" Philips/Magnavox direct view CRT I had been watching since 1999!
There is a bright purple light emitting from the rear left of the tv which is only noticeable when your room is dark. I assume the light engine/tunnel is in there somewhere. This doesn't really bother me, but I supppose it could be a negative for some people. Also the audio/video connections are sort of towards the right side of the tv instead of all the way in the back, but this doesn't bother me either. This could be seen as a positive actually, as you don't have to reach or crawl around to the very back of your set to mess with the cables.
So the only negative for me on this set is the rainbow effect. I'll let you know if it becomes annoying to the point that I decide to return it. I'm pretty sure I'll be keeping it though. Friends and neighbors have really enjoyed my new 46" DLP so far too. We were watching that Austin Stevens Snakemaster guy searching for the King Cobra in HD, and one friend remarked that he got an emotional reaction (startled fear in this case) that he never would have gotten watching SD programming on a 25" tv.
Hope that helps. $970 is $30 cheaper than I paid too. Enjoy! You'll probably want to turn down the brightness, color and contrast, and turn off the DNie. It's going to be overly bright and contrasty right out of the box. Use the "Custom" mode for your settings.