I agree with Elizabeth that the CD sprays and green pens do work, at least in my system. In fact, sometime the change is so obvious that you need not have a duplicate CD to compare. However, I also agree with Cornfedboy about Mapleshade. When I first read this post a couple of days ago, I choose not to comment, as I did not know the facts. Now that Cornfedboy has provided us with Mapleshades exact claims, I must admit that the performance gains they promise would almost constitute a miracle. Perhaps I should buy these products, and try them myself. If the product is really as terrific as Mapleshade claims, there should be no problem with a refund if I am the only one who gets different results than advertised.