I had it for 3 year and liked it. No complications.
However, after 3 years and some research, I didn't feel comfortable not having a period anymore. While certainly not pleasant, I think it's natural and healthy for your body to do what it's supposed to, and your period is a great berometer for your "female" health. I was worried that my uterus not shedding itself the way it's supposed to would make it more prone to other problems, mainly cancers. The image I couldn't get out of my head (whether valid or not) was of a stream that flows consistently doesn't allow things to grow. Standing water that is not circulated starts growing all kinds of yuck.
Sorry if it's TMI, but that's how I felt about it, so I had it removed. Also, I'm not wierd, all evidence to the contrary :)