Just have to add that we are definitely enjoying our g25. The black levels are freaking insane. The THX mode renders the colors incredibly accurate and lifelike, and is still user adjustable if needed. I know when I bought the tv, the THX mode certification was somewhat part of the decision, but I didn't realize how well it would actually render the overall picture, it is near perfect regarding contrast, color, balance, and overall uniformity. I am a video newb so take with a grain of salt but for the price compared to some of the LEDs or pioneers I couldn't be happier.
The vivid mode is freaking cartoonish and gave us a bit of a headache after the wow factor went away, and standard is a bit off in how the colors are portrayed, but the THX certification mode is the real deal.