I've had mine since June 2013 and the only issue I've had in the long term is that my periods are a bit longer, which doesn't bother me.
In the first few weeks after having it, I had a bit of cramping and spotting in the evenings, but thats fairly normal. You need to give it 6-8 weeks to settle and your body to get used to it.
I've never used condoms with it and its never been an issue. Its one of the most reliable methods of contraception available, so if you're in a committed relationship, you should be able to ditch the condoms.