Gotta second Rachel D - I had it and it was not good. I didn't get my period at all but lost my hair in clumps and couldn't not shed an ounce no matter how hard I tried. the hormone mimics pregnancy in your body - and if you've ever had trouble with Depo Provera or progesterone heavy birth control it's not going to work out well for you.
After trying for 4 months to lose some weight (and literally the scale did not shift even an ounce) i had it removed - within a week I'd lost a pound without even trying - I weighed myself coming off a week long vacation and was DOWN!
good luck - i've had friends that loved it but it did not do well by me.
to Val G - if you read my "negative" response again you'll see that i said it didn't work well BY ME (hey maybe i am the problem - wow) and that if she has trouble with progesterone heavy bc it might be a problem (again - not telling anyone to REMOVE IMMEDIATELY OR YOU WILL DIE)
geesh this is an online forum not a medical office