I really really wanted to love my Minera IUD. I have a good friend who loved hers and it seemed so simple. I ended up hating mine.
I had pretty bad cramping off and on for three months. The doctor's office told me it was "normal". That finally calmed down and was only during my period. (Which they told me my period would stop. It never did.)
In fact I bled non-stop the entire time I had the thing in. I spotted for 13 months straight...sometimes a little heavier than spotting...and had my normal periods. I never had a break from bleeding. Panty liners everyday and sometimes worrying that they were not enough.
I had it removed at my next well woman check because I couldn't take it anymore.
That was my experience. I lasted a little over a year and was miserable with it. But it gets great reviews. My OB/GYN told me some people love it and some hate it. Either one or the other.
Good luck!!