I have been using nuvaring for a few months now and I love it! I love not having to worry about birth control daily. Plus, I have don't have cramps or bloating anymore - that's my favorite part! The only negative thing is a little more discharge throughout the month (as opposed to just before my period on birth control pills), but it's not bothersome at all. I just use pantiliners.
As for guys feeling it during sex, it seems to depend on the position. My fiance could feel it sometimes and it didn't bother him, but other times he said it was "rubbing too hard" and asked me to take it out. Of course, I put it in right away when we're finished (you can take it out for up to three hours). Anymore questions, just ask :o)