M.S.
I did use the mini pill while I was bf my first, and I don't know what I would say was side effects from the pill or just hormones from bf, but now I have the Mirena and I really like it. I had been on a normal pill for years, and the biggest difference for me is I don't feel like the hormones affect my libido as much-the hormones don't affect you like a pill would. I would recommend it, and I agree with the other post--the insertion is uncomfortable but not a big deal, and it might feel odd for a couple days but then be ok. I have several friends who have the Mirena and they all like it, too.