I returned mine, but found the picture quality to be exceptional when fed decent content. 1080p videos from Microsoft and Apple are amazing, but keep in mind that this set will definitely make you realize how good or bad the content your viewing is...
I was planning to keep this TV for at least 5 years and wanted to buy something that would be as future-proof as possible so the ability to handle a HTPC signal was critical. Samsung, IMO, dropped the bal here by failing to offer a digital path for such a signal and was the biggest reason I returned the TV. The handling of SD content, while good, was also not to the level I felt comfortable with. When viewing SD or even some HD content at about 3-4ft away, I could see artifacts, blocking and noise... most, if not all, the result of poor encoding and overcompression and certainly reproduceable on any HDTV. Don't get me wrong, it's probably one of the best LCDs available right now, I just have some rather high standards that I feel should be met if I'm going to spend ~3k on a TV.