Got my 50" about an hour ago and have been playing around with it. WOW. This thing BLOWS AWAY the LG LM6700 LED TV I bought 3 weeks ago. That thing is going straight back to the store!!!
The blacks are AMAZING! Color is ridiculously good. The reason I wanted to get rid of the LG was because when I played NBA 2K on xbox360, there was so much motion blur that it just made my head hurt. But on the ST50, there is ABSOLUTELY ZERO motion blur, ZERO lag. It's a gamer's dream TV I love it!
The only thing I dislike is the plastic casing that wraps around the screen's edge. I just wanna rip this thing off. I have no idea why Panasonic put that thing around the screen. But it doesn't affect the amazing picture so I can live with it.
The build date on my TV is February. There is a slight buzzing noise but barely noticeable unless I'm close to the TV. Anyways, here's a quick shot I took with my iphone (BTW, I'm using D-Nice's non-prep settings. I don't have the patience to run slides for 100 hours.)