Longtime lurker/reader, thought I'd contribute. I've had a Derminator for some time, like, 2 years. I got it when I was researhing dermarolling for hair growth and the evidence in my mind that it works is strong, but requires commitment. I lacked the latter part of the equation. I just thought it was a hassle to use. So it sat in a drawer. A few months ago, I bought a dermapen as I thought it would be more convenient and have been using it on average once a week at 1.5mm. It hurts enough that every week I feel like putting it off, but do a half-assed job just to get it over with cause, well, it hurts. Today I thought, why not try the Derminator to compare the two as far as pain goes? I did. I finished up about an hour ago, and found the pain with the Derminator was significantly reduced. I mean to the point where I could stand it to the point where everything part of my head that is thin was red. I even went up to 2.5mm and it was still less painful than the pen. I've been sporadic in my approach so haven't seen results, but I'm committed to doing this plus minoxidil once a day and see if I can get this grass growing. I'm AA and wear my hair in a small fro, but use filler as there is significant loss in the crown and the hairline. I've grown certain areas long to cover these thinning areas and it's been pretty effective, but getting harder and harder to maintain. Goal is to see a marked improvement in 6 months using this regimen religiously.