I've heard of it,and it sure is expensive.
Then I did homework,and searched the web,and found similar products on e-bay.
I ended up getting a palm-sized one. Don't know,could be a combination of things,but my hair has really grown.
This,after doing a stretch,and getting relaxer a week ago.
I need to get my camera together to chart the progress.
I say,the less expensive work just as well as the waaaay expensive ones.