G.M.
I really love the copper/no hormone IUD (10 year). And I have friends who love the Mirena IUD with hormones (5 year). I react very badly to any hormonal birth control, so for me a 10 year solution that I never have to think about, with NO hormones was perfect! I had it taken out when I wanted to have a baby and got pregnant immediately.
Yes, I do experience heavier periods but for me that is no big deal since my periods weren't bad to begin with.
Good luck!