I got Mirena after my son was born and I loved it! It didn't hurt to have it inserted (just very mild cramping, but very quick) or removed (I didn't even feel it). I had it for just over a year b/c we decided to try for another one (we're due in Nov.!). I never had a period, only light off/on spotting for about 5 weeks, which is normal. I will definitely get it again after our next baby.
As with all birth controls (and other meds for that matter) there will be some with negative experiences. But from talking with other moms, I've found there are far more people who had a gret experience than a bad one. Basically, you'll never know until you try it for yourself, but chances are you'll love it!