I only use the comb on my hair line and in 2 weeks I saw a little difference. As a person from african decent I didn't think it would work but actually it is working on my once upon a time receeding hairline.
My only problem with the comb is that I have to keep on remembering to get batteries I wish the comb was electrically rechargeable.
Recently bought this as far as I know this is the same sort of style tool used at the belgravia hair specialist
Will see how it works out in a few months and what progress is made