I purchased a laser comb several years ago because of all the buzz it was creating in the industry. After a good several months of using it, I didnt notice much of a difference although my hair did look a bit shinier. In my opinion the portable laser combs they sell are fairly ineffective because they do not have an adequate amount of lasers. However, a salon uses a much more powerful machine because the lasers encompass the entire head instead of just one spot- almost like a helmet.