I had my shoulders and upper arms done, had to go back three times and it's not totally gone but it's a great improvement. The pain was negligible and there was no scarring, but the follicles will be noticeably red for a couple of weeks.
If you have light skin and dark body hair, you will get the best results. My only problem with it is the expense, I think it's overpriced considering the process only takes about 30 minutes. You may want to get an estimate on how many visits it will take, and then try to negotiate a package deal.