Kris, my gf, got mirena two months ago. She had a pretty easy time of it, switching from Depo. Painful cramps for a week and some random bleeding that gradually got better. None since then. We had to to be gentle with that area for about two weeks, but that was about it. Copper is supposedly more likely to be rejected by the body and can cause heavier monthly bleeding. Her doctor didn't recommend it for someone who hadn't had a kid yet. Overall feeling like she had less issues with mirena than many people.