I heard of these things for years but never really took them seriously. Never thought I'd get the chance to try one either. I like the science of things, and they explain that the pressure these nails produce is far less to break your skin, as long as you stayed still.
I was the only one brave enough to try it. I had to feel what it was like. And it was...uncomfortable. While I didn't need a band-aid, you do feel the nails against you. I was relieved when the WonderWorks team member turned the machine off.