I like mine a lot.
The insertion was very uncomfortable - if I do it again in the future, I’ll bring my husband to hold my hand. But it seems YMMV - don’t know if it’s the skill of the practitioner or the body of the woman that makes the difference.
But it was totally worth the discomfort! I don’t have to prepare ahead of time to have sex, or take a pill every day, or use condoms. I can breastfeed my baby since no hormones are involved. I have a normal hormonal cycle every month (unlike when I was on the pill), which happily includes several “no man is safe around me” type days. (Not literally of course - monogamy is pretty much required for using an IUD and I’m happily married.)
I do bleed very heavily during my period, and have very slight breakthrough bleeding at other times of the month, but not even enough for a pantyliner, really. And my understanding is Mirena usually prevents that.
I used to have awful cramps. Then on the pill, I hardly had any. Then I had a baby, and had the IUD put in, and I have somewhat bothersome cramps sometimes. So I’m still better off than I was before I started the pill (though that may be due to my uterus going through pregnancy).
My husband can feel the strings, but he says it’s just a little odd, not painful or bad in any way.
Oh and I get pregnant if I borrow his toothbrush, if we aren’t using anything, and it’s been a year with no accidents, FWIW.