I recently bought a Samsung HLP5063 DLP TV, and was advised to do this ISF calibration after 100 hours or so on the set. We were charged $325 for it, and it hasn't been done yet, because the guy is still trying to get the codes to get into our particular model. Anyway, my question is this overkill, because I've recently heard of several different discs you can buy that will do a similar job. This is all new to me as this my first HD TV. Any feedback greatly appreciated. Thanks.