I had a horrible experience with Mirena. The doctor that put it in cut the strings too short. I didn't realize it at first, but when I started seeing a new doctor she said that she couldn't find the strings, etc.... they quoted me a price of almost 20,000 dollars to have it removed. My insurance didn't cover birth control so this would have been out of pocket. Basicly, they were going to do surgery in order to get it out. All because the strings were too short. I went back to the doctor that had put it in and demanded they remove it without surgery - which may not have been smart and I still don't know if there is any residual damage from having them remove it. But, it was very painful!!! They had to first, locate the strings and then try to grab them and pull it out - it took a while, and they had to use something to hook it, which hurt because they couldn't grab the strings and kept hitting me with it! I had horrible cramps for days afterwards. I don't know how common this would be, but I would never recommend getting one. I'm sure you will also get plenty of comments about heavy acne, weight gain, and I had stomach pains with it. I feel more like myself, I have more energy and don't have pains since I had it removed.
I hope this helps you make an educated decision. When I was having it put in, the doctor assured me that it was easy to remove. Good Luck !