I haven't done this, but my OB suggested it and I did a bit of research. There was a lot of mixed feelings and different information out there, and I decided to hold off on getting it done. Basically, it is a coil that is inserted up into your fallopian tube. The presence of the coil causes irritation which causes scarring which causes blockage of the tube. It takes most people 3 months to have the tubes become blocked, but some people need 6 months. You need to make sure that you are not allergic to any of the contrast medium (dyes) because that's what they use to confirm blockage. Basically, I've read that sometimes the coils fall out the tube (either coming back through the uterus and literally falling out the vagina, or going out the top of the fallopian tube and floating around in your abdominal cavity), and sometimes they stay in the right place, but the tubes don't block, which increases your risk for an ectopic pregnancy. I've also heard that your periods can be a lot heavier, but some of that seemed to be people comparing their post-essure periods to those they had when on the pill. That wouldn't be a fair comparison because periods on the pill are not as heavy. Anyway, do a lot of homework on your own before you decide to do it. I felt like my OB was a little "gung-ho" and it made me uneasy. Good luck!