I am having an ISF calibration done in a few days. They Tech. gets an extra $100 for installing Duvetyne inside the cabinet to make the picture brighter. I already know this could void your warranty; however he has had 2 instances where the repairman came out and asked what's this stuff? They told the repairman and they said that's neat. My question is will it make your HDTV run any hotter, or there any disadvantages and are the benefits worth the cost? I have a new 73" Mitsubishi Diamond with tuner. I love this set and enjoying wowing my friends and neighbors who can't believe the picture.