I too have considered using an ISF tech to calibrate my 55" Sony LCD RPTV. I tried calibrating the TV using the video essentials disc and found some improvement especially from the dvd player. The HDTV signal is terrific, but like all LCD RPTV, SDTV has the screen door affect. I'm not sure if the tech can eliminate this affect or will there will be a big difference in overall picture quality to justify spending $300 - $400.
By the way, will the TV need to be re-calibrated over time?
Thanks, Ron