Hi, I have had Mirena for almost 3 years now and absolutely love it! I've tried every pill form of BC it seems like plus the Nuva Ring as well and Mirena has worked best for me by far.
I did experience a little spotting and cramping when it was first inserted, but nothing I couldn't live with. I had a regular period the first 3-4 months, but since then my cycle has pretty much stopped. I do get a little bit of every 2-3 months that lasts about 3 days and it's VERY light. I've noticed that I tend to get one when I stress too, but still it's VERY light and I have no cramps! I would definitely reccomend Mirena to anyone!
My husband and I only have 2 kids together (as well as 4 kids from his previous marriage; they live with their mom), but we have decided to not have anymore kids... so rather than having my tubes tied, I'll continue with Mirena and in 2 years I'll get it replaced.
I hope this helps!!