So I can say, without question, that my set has undergone changes in the last week or so of ownership. After spending considerable time "re-calibrating" the 50" with my AVS709 disc I'm more satisfied than ever with the picture I'm able to achieve.
This is not a perfect set and the color saturation along with the really questionable gamma in anything other than (too-dark-for-me-in-anything-but-a-pitch-black-room) cinema leaves me a bit at odds on a recommendation for this display. On one hand, it's a capable media-room set and the PQ will compare with models costing hundreds (if not thousands) more if fed a quality source. On the other hand, it's narrow margin for error and seemingly limited capability in a bright room makes it a tough sell against other sets that, while they may have inferior PQ, might be more well rounded for someone shopping in this price range.
For me, I just wanted a monitor that would make it acceptable to watch movies again. With no guarantees that panasonic has fixed the rising blacks issue that so handily ruined my 2008 46"-- I'm happy to NOT overpay for another flat panel. The S fits the bill.
What to do if you find yourself stuck with no hope of rescue:
Consider yourself lucky that life has been good to you so far. Alternatively, if life hasn't been good to you so far, which given your present circumstances seems to be more likely, consider yourself lucky that it won't be troubling you much longer...
-- Excerpt from the Hitchhiker's Guide to the Galaxy.