Well... On the plus side, it's very easy to get going with. Simple, clear instructions. Also, I think it'll be easy to get into the habit of using it - just add it as another (quick) step to your morning and/or evening skincare routine.
On the down side, I was surprised that I could feel it even on the lowest setting. Not exactly painful but heading in that direction. I'm using it on my upper lip, which is quite a sensitive area. I expect I'll be able to get up to the next level, but probably not higher than that. To compensate, I'm planning to use if morning and evening (which is permitted).