We have enjoyed our PDP50A5HD (from Costco) for over 3 months now.
We think it has a great picture on SD and HD sources. We also like the features like included HD/SD tuners and cablecard allowing us to use it directly connected to cable or antenna (No STB needed).
See attached pic of local PBS HD channel (taken with flash)
The second pic was taken with my camera phone showing a number of sets on display with the Pio.
(from L to R) (from memory)
?Visio 50" PD ?, ?Visio 37" LCD ?, Panny PD 42" ED, Philips 32" LCD, Pio 42" PDP-4214, Pio 50" PDP-50A5HD.
The quality of the pic is poor but it does show the relative black levels between sets.