This product I really like is disadvantage are patience, time of use, the fact that it's hair by hair and sometimes difficult to use. I had used it a few years ago the jersey / lower legs and backs frankly hairs are much sparser than before! I see that there is plenty of space between the bristles. It's very long because its use is made hair by hair and it takes several seconds each hair and sometimes longer then with pliers turn the hair on himself and pulled (it comes out alone without pain but if it hurts in the outgoing is that his did not work). Moreover, its low purchasing suddenly make it a great tool, I am happy to find this product on Amazon. For now, I would only small areas such as the armpits (which I've never worked actually) ... it is cheaper and less risky than the laser and flash to have no cancer risk skin (only in my own point of view). Then, with rechargeable batteries is perfect :).