I had the Mirena in for four years with only a minor problem with some cramping after a couple of years, which I had an u/s for. The lining on my uterine wall was very thin and this was probably the cause. It resolved itself. Was a bit ouchy to have put in by my ob, but nothing much. Provided excellent birth control for the time and didn't interfere with bfing at all. Never bothered DP.

I did find it took about three months for my cycles to get back on track after having it removed, so I'm not sure I'll have it if we want more children, only because I'm worried it might affect me more as I get older. But once we are done and before DP gets the permanent snip, it'll be the way we go.