I bought a KP51WS510( last year's model) late this summer and I find nothing wrong with it. It has a great picture right out of the box. For the price, it has the biggest bang for your viewing buck! It's replacement, the 520( which is mechanically identical, I think) can be had for a little over 2k here in Calgary on sale( sometimes less!).
If you respect it's limitations, wrt to the ideal viewing environment and angles, it provides you with a lot of enjoyment for a modest price;one of the benefits of a mature technology...............
It doesn't perform well in a room with a lot of ambient lite. It is meant to be in a dark, windowless room....like a home theatre room!...hmmmmm....I have mine in a sensory deprivation chamber I call my home theatre room
It was a purposely built room for viewing movies with a CRT RPTV in mind. The front wall is flat black, the side walls are dark eggplant? and the ceiling is flat black! With all the wall sconce lites on, you bearly get enough lite to find the remote and DVD case.....
Kind of like the glow of the event horizon around a black hole
I have the back of the TV backlit for movie/TV viewing as per the usual reasons..thanks again to all of these great forums!