I bought the DVD from Blackjackscience.com to add more info to my advanced techniques library. The DVD doesnt play. The dvd ruined my dvd player. Now NONE of my movie dvd's no longer work in the dvd player. Very low quailty dvd. I wish they would of took the time and put the info on a high quality dvd disc. This was the first time I ordered an instructional dvd. Now I know.. its best to stick with the books and to never order an instuctional dvd or a video ever again. I'm now attempting to get a refund on the product. So far, no response from them.