I've had it twice, both times no periods -yay! I had it removed to TTC and ended up having twins (although they are in my family) and then went on to have another. I've decided no more for us and have had my second one put in recently. It took 18 months to conceive the twins after the mirena was taken out - which was odd. But it only took a one time oopsie to conceive number 4. So not sure if the mirena made it take longer to conceive or not.
I have never had any issues with mirena - I think it is great.