My issues was that for the first two months I was getting a period every two weeks. That was annoying. Before the iud, I started getting clitoral yeast infections every cycle. So basically there was about 3 days where I could actually have sex between the end of the period and beginning of infection. Those were some bad two months LOL! But last cycle was normal. Still got the infection, but I'm now trying to fight it with vinegar, a cotton swab, and a high pain threshold.
I also had a bit of a reaction from the copper. I didn't realize I was a high copper person to begin with (explains a LOT), and this added copper left me a bit nauseas, spacey, tired, etc. I started taking zinc and vitamin C religiously and that has evened out. For more info, go here: http://www.healingedge.net/store/page190.html
Hopefully my periods will continue on a monthly basis and I won't develop problems down the road, because right now I really really like it!