Mirena IUD

Meredith wrote asking for experiences with the Mirena IUD:

"I've been reading all the stuff the Mirena people put out about it, and I know the listed side effects, etc. I guess I'm just looking for experiences from women who have gotten one. Was it uncomfortable to have in all the time? Does it affect your periods? What about mood swings? And I think it's a dealbreaker for me if it lowers my sex drive or makes my skin worse."

So if you've had or have the Mirena IUD in, can you give your experience with all those aspects? Thanks.