its more pain than what it's worth! it is really really painful - more than waxing, and it doesn't even last that long. i get a rash for about 2 days after using it, then the hairs are already starting to grow back the next few days. i was under the idea it lasted about 4 weeks, but there is no way it does. and the ingrown hairs, as somebody else mentioned, are a nightmare.
as for using on
bikini line - you can but it is just extra painful. some epilators come with special parts to add to it, so that it's easier doing the smaller fiddly areas. mine didn't, but its still easy to use on the
bikini line without it.
and don't be fooled by the "now painless" gimics - it's not true.
if you are going to buy one - get one on ebay! saves you paying 60 quid in case you never use it again!!! i paid a lot of money and now regret it as I can't cope with the pain.
however, if you do stick with it for 3 or 4 epilations, the pain does lessen (or you just get used to it!)
i also have a problem with hair removal - i dont have thick hair, but i have very sensitive skin and always seem to get ingrown hairs. and i still haven't found a solution

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hope this helps! i will finish my essay now!
claire x