I did my bikini area. Well worth the $600 I spent - no more painful waxing!!
The hair doesn't "fall out". You shave right before your appointments. (if you did it without shaving, the smell would be awful because it actually burns the hair).
I had a total of six treatments, and after each one, the amount of hair that grew back was less and less.
It is a bit uncomfortable, but no where near as painful as waxing.
BTW, I started my treatments at the beginning of the summer, last year. The technician never said anything about avoiding the sun. I spent a lot of time at the beach, boating, etc. and didn't have any problem. However, I do use a lot of sunscreen.