It all worked out because we had a great sound engineer who was able to adjust on the fly, but the first few songs were a bit tricky. Once we got the mix dialed in, it was all good.
The sound guy loved the fact that we were using IEMs. He said that it made his life so much easier because he was able to keep the front of house sound clean without the noise and potential for feedback that floor monitors cause. Personally, however as the bass player, I do feel like it was harder to grove with the drummer, but the crowd seemed to love it none the less. We had a great crowd, which always makes a show more fun to play.