Mirena
"I had it put in after the birth of my second child.  The insertion was extremely painful.  Since having it put in I have experienced multiple infections which can only be attributed to the device.  I also have had a change in mood and behavior, which was never an issue prior to Mirena.  I chose to have it removed.  I am happily married and would much rather get pregnant than deal with all of the side effects from Mirena. This is by far the WORST form of birth control.  It's only good for five years if you can stand it for that long."