I just picked up the Z50PV220 from a local Sears. Aside from my Macs, I can't remember being as pleased with a tech purchase so quickly.
In a week, I've noticed that blacks have darkened, I've learned that some modes, like the APS mode will adjust to ambient light and sometimes appear to flicker. Image retention is visible once or twice a week on certain backgrounds, but never lasts more than half-a-minute. Color appears better out-of-the-box than with my calibrated 34" Sony 34XBR970.
I've also learned that most stores' HD demos look like low-rez YouTube videos. This actually put me off buying a big TV sooner. With this set, at this price, I took a chance. PS3 gaming (component input even!) and 1080 content is just superb! SD content isn't half bad, either, and better than I expected. The remote is simple and has good feedback. I'm just giddy with the picture I get out of this thing!
Clearly, coming from the Sony CRT (arguably the last great CRT available), I have certain tolerances and preconceptions: glossy screen, geometry imperfections, super-good SD processing, power guzzling, massive weight, great color and white and black levels, component and HDMI inputs. The Z50PV220 bests ALL OF THEM.
Now, WTH am I going to do with my 34XBR970?