I have a panasonic pz80 in my basement and now i have the g25 in my living room. A few years makes quite a difference in technology. What is the difference between 120hz. vs. 600hz.? what is the difference between 30,000-1 native contrast ratio vs. 5,000,000-1 native contrast ratio? After calibrating the g25 i have people telling me that contrast should be higher than in the 50's brightness is around 60ish. I have the contrast set at 70 now, and the picture looks great, although i guess it takes time to adjust your eyes to new settings. My question is : can the contrast set in the 70's do damage to the tv long run? i always remember people saying contrast should be low on plasma tv's to avoid burning it out early. is that a myth or is there truth to that? Keep in mind that i calibrated this tv with DVE, but i am no expert and i am learning as we go along. The colors are super on this panny by the way.