From doing 3 touch ups with it I have to say it feels less damaging. My hair doesn't feel dry and bleached. It feels soft after you rinse it out. Most bleaches feel horridly dry after bleaching before shampooing and conditioning. I do feel there is less damage. Now the big key with this is it must have a heat bonnet to process. Sally's sells one thit's supposed to be less likely to blow out the cuticle like regular developer. I personally am hooked on it. I use bleach and do on the scalp and with this I don't have a dry and itchy scalp after processing. My hair is shiny too. i admit a true evaluation will take 6 months but it definitely does not harm as much as regular developer. I'm hooked on it and do believe it doesn't damage as much.
I do want to mention for anyone who decides to try bleaching, you really need to know what you are doing. Any processing done wrong can destroy hair in a heartbeat. I have a very precise process when coloring my hair.