I was considering the Paragard IUD (copper IUD) and when I talked to my OB-GYN about it, he told me that that it would not be a good idea for me only because the uterus identifies it as a foreign object and will have more cramps and contractions to get it out, which for some women is ok, but I already have really bad periods and cramps so it would intensify it, I also learned it doesn’t necessarily stop fertilization, it only makes the uterus a toxic environment and prevents Implantation (which may be the case in the Mirena IUD also). I do like the Idea of hormone free devices but I couldn’t handle the cramps, so I choose the Mirena IUD and absolutely loved it, No periods, no cramps (well, mild cramps with spotting monthly but not enough for even a panty liner) total freedom, I hope what ever you choose, you love it and experience that type of freedom, its so great.