Mirena, thoughts?

So I went on depo provera when I was 14 and two years later I got off of it and went on the implanon and it's been 3 years now and I'm due to get it taken out and I think mirena is what I want to get next. I've done my research. And it would be nice to have lighter periods as I have irregular bleeding and heavy periods with a lot of cramping now. I have an appt with planned parenthood on the 17th to get it put in but I just want I be 100% sure. What are your thoughts about mirena? What was your experience with it like? Any information would be appreciated. Thanks.