I'm medium to fair skinned with dark bikini line hair and underarm hair, but otherwise relatively light body hair. We have a pool and 1 year old twins, and I hate to shave my underarms and bikini line. I get ingrown hairs everywhere and it never looks cleanly shaven. I just wanted to be able to throw on my bathing suit whenever without having to jump in the shower to shave.
I have been using the silkn sensepil biweekly for the last 8 months on my underarms and bikini line only. Takes about 2 minutes biweekly with about 7 zaps per underarm and about 15 zaps per bikini side. My cartridge replacement indicator is just now telling me to get a new one, which is why I'm on amazon.
I didn't notice results right away, and I didn't expect to after researching how hair growth/removal works -- If the hair that is visible is in its growth phase, the silkn sensiple kills the hair folicle preventing future hair from growing from that folicle. Otherwise, it doesn't have any affect on the hair, so you may have to treat a visible hair more than once to get it when it is in its growth phase in order to kill it. Then the hair from the dead folicle still has to grow out and fall out which can take up to 2 weeks, so it appears at first that all hair is still growing. After two weeks, though, you'll notice less and less hair reappearing. And it is growing from the folicles that didn't have hair during prior treatments so the folicle couldn't be killed during those prior treatments. Because a follicle may not grow hair for a year, it can take up to a year to kill all of the follicles and acheive total hair removal.
So as I expected, the first few months it appeared that I had just as much hair regrowth as normal, but after that I noticed less regrowth and now my bikini line is virtually hair free. My underarms still have some hair, but it is probably 25% of what was always visible before I started and what is visible is very fine and I never get ingrown hairs. I don't shave between sessions (just right before my biweekly session) and typically I am comfortable wearing sleevless shirts in between sessions.
You really have to be diligent about performing the treatments on schedule. I got off schedule one month and had a lot more hair regrowth afterwards and HAD to shave between the next few sessions.
Very happy with results, and am hoping that next summer I'll just have to shave my legs. maybe I'll even start treating them.