I had the mirena for many years, and as i started to put on a bit more weight, and also to have more problems with breakouts on my skin, I decided that to rule things out i'd get it taken out.
I too was worried about the return of periods, and it hadn't been exactly fun getting it put in either.
I didn't notice any change in my skin or weight or any other symptoms that i was hoping to pin on the mirena after taking it out.
We ended up getting pregnant not long after having it removed, but i will be considering using it again in the future.
I know a lot of people online seem to say they have problems with it, and i'm sure they do - however just thought i'd share the flip side - for me it is a great form of contraception.
Think maybe the weight gain and skin problems in my case were due to either stress or ageing