You guys can alternatively try Insight CD offered by http://www.awakenedminds.com

Its only around twenty five bucks without shipping, and won't put you through the upheavals that most of you feel when using Holosync while achieving the same result in much less time. Well at lesat for me it did. I tried both products, and now I just use Insight.

Also check out its Focus CD sets. Those are really good, too.