If this is a FAQ, I'm sorry..... I have a Pioneer Elite HD 520 (7 months old) and I think I'm ready for ISF calibration. I watch mostly DVD's in my 15 x 15 family room off the kitchen. I do have a black out shade on the window behind the couch (opposite the TV), and usually lower the kitchen lights. The dealer tried to dissuade me saying an ISF picture is "too dark." I don't mind the cost, but if the calibration won't give me a better picture, why bother. I'm really quite happy with the DVD picture as it is. Cable of course varys from acceptable to horrid. What's your experience with the calibration? If you've had it done, would you do it again with a new set? Thanks!