H.W.
Well, if my epi-lady (back in the day) was any example, they work at making it incredibly painful to get rid of hair. You do understand that these just rip the roots right out, not in one fell swoop (or one big rip, as waxing strips will) but repeatedly, over and over and over.
I used mine once, for about three minutes, and never touched it again. I can handle waxing. This, I could not.