I bought one a WHILE back and I only used it once I believe. It just made me totally frustrated...either it doesn't work or I just don't know what I'm doing.
In order for my hair to slide through the machine successfully, without me pullin' it through, I have to part each piece of my hair paper thin....if I do that I'd be there all night and I don't have the time/patience for that....and when I look on the little window, I hardly see anything that's been cut off...so then I thought it wasn't working. But then again, like I said, maybe I don't know what I'm doing.