Let me start by saying that I'm in my late 50s and my hair color has changed from blonde as a child, to brown and now to mostly grey. I'm a light skinned caucausian of English ancestory. I used Nood twice a week for 12+ weeks. On my armpits where the hair was still mostly brown, I have seen a 90% reduction in hair. On my back and privates, only a 20% reduction. I'm guessing this is mosly due to my grey hair. On the back of my neck where there had been some tanned skin the reduction has been about 50%. It is very easy to use. The only power setting I have used is 7 (max). It is painless unless you don't shave first and then it feels like someone is snapping a rubber band on the spot. Not painless but not totally pain free. I would definitely recommend this for someone who's hair hasn't gone grey. For the rest of us I don't think this, or anything else will result in permanent hair removal. I'm not going to ask for a refund as I knew going in that it might not give me the results I was looking for. I took a chance anyhow.