So far so good with mine, I got it in May at my 6 week post partum. My first few cycles were a little weird and I did spot the first 6 weeks on and off. More of a nuisance of not being prepared...out and about without pantyliners type of annoyances.
What kinds of problems if you don't mind me asking? Maybe it wasn't inserted correctly or something???
I have one other friend who has it and she loves it as well and our experiences were very similar w/spotting. I don't even think about having it most the time.
I hate to hear you are having a problem as I was thrilled to learn about it. I can't do the pill, and i had alot of issues on the shot and will try and talk everyone out of that-esp if thinking of having more kids- so this has been a real blessing...nothing to think about for 5 years unless we want another kiddo and then no wait (supposedly) if that were to come up. So I have to rave about it.
I hope your issues were isolated, but glad you brought this up, just to see if others had different experiences as I am sold on it...SO FAR...