I've had my 55" for about 2-3 weeks now so I am well over the 100-200 hour "break in" period. After trying D Nice and C Net settings posted, I just was not happy with the pic quality. Just way to intense is the best description I can think of at the moment. I do not have the cash for a true ISF calibration so I have done the best I can and now I am SUPER happy with the pic.
I have an HD dvr, a PS3, a Blu ray, and HD-DVD all hooked up thru HDMI to my Onkyo 608. Then a single HDMI to tv.
For my HD dvr, I used an HD color bar pattern I recorded off a HBO channel in the middle of the night.
For my HD dvd player, I used HD DVE calibration disc.
For blu ray and ps3, I used both the Spears & Munsil calibration disc and the HD version of THX found on the Terminator blu ray disc.
While I did find that SLIGHTLY different settings looked better for each source, it was very easy to find a middle ground to "split the difference" and I feel all sources look awesome now. (All settings in the sources left at default, only TV settings used).
I cant say how happy I am with this set. My first plasma. I never new how black black could be! Even though they seem radically different from what I have seen anyone else post, here are my current settings for 2D (have not even touched 3D yet!)
Color Temp Normal
Color Mgt off
Video NR off
All WB controls at 0
Black Ext +5
Panel Brightness Mid
Contour Emphesis off
HDMI/DVI RGB range non-std
content type off
Mosquito NR off
Motion Smoother off
Black Level Light
24p direct in 60hZ
I was surprised / impressed that the color / tint was so accurate.