I have had a Bodygroomer for some time. I have never cut or nicked myself with it, not even on my nut sack, and the only trouble that it has given me was that I once damaged the little piece with the cutter in it by dropping it (this happens very easily when you are cleaning the unit; I dropped the piece several times, but only once did it get bent) and it had to be replaced. I no longer use the thing, though, because now I only trim my body hair short rather than raze it, and for that purpose I find that an ordinary buzz cutter with a built-in adjustable comb (I don't remember the brand name and I haven't got access to it now) works much better. I think that you are better off getting a good buzz cutter and trimming your hair short, then, if you want to shave some particular parts completely, use a razor and shaving cream or gel for the purpose. (Two further bits of advice on that point: (1) Do not use a plastic disposable razor: they are too light to work without extra pressure, which causes nicks. Use a metal-handled razor. (2) Shaving every day reduces the chance of nicks.)