I got the Mirena a couple of years ago, and I have to admit, it was very painful when it was inserted. I haven't had any kids, so that extra stretching was oh-so pleasant. It took me about 4/5 days to get over the pains, but now it's no problem. I get minor cramps and have tiny periods every now and then, but I think it's way better than the pill. I just dread when I will need to get it replaced, yikes.