I agree.
ISF calibration is worth the time and the money to have done. I was really amazed at how much better the picture looked after my Mits was calibrated. I though I had done a pretty good job with the DVE DVD and was very skeptal at first, but the calibrator made a believer out of me pretty quickly.
It is to bad the industry cannot just get together and agree that the color guns are as accurate out of the box as possible based on current standards.