I am about to have mine removed. Had it in 6 months, and have experienced mood swings like PMT, although i never suffered from that before, have had various rashes on my hands and feet, feel knackered all the time, and have had increasing headaches, now about once every 2 weeks. It may not be the coil, but that's the only thing that's changed since all these symptoms started. And many of them match what i've read about on the v. long mirena thread.
Interestingly, i had the depo injection for 5 years before having DS1, and had no problems whatsoever apart from putting on 1 1/2 stone over the 5 years (slowly, so i didn't notice at the time, but it fell off in 2 months after i stopped the injections...). That's why i thought the coil would be ok for me. Now I'm just looking forward to getting rid of it, although it means a return to the condom...!!