(Hope no one minds a mostly lurker responding. And TMI below, I'm sure.
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I have been on Nuvaring for over a year (I think), and for the most part, I have been pleased.
When I was on oral BC, I tended to go nuts around the time of my placebo pills. Huge mood swings, deep lows, etc. I still have that some on Nuvaring, but not nearly so severe.
Also, sometimes the ring makes you itch. A lot. It has stopped doing this to me (thank heavens), but it was very nearly unbearable for a while. I would count the days until it was time to take it out and get my period. Usually it takes four to five days for my period to come once I have taken the ring out, which is rather annoying. Adding to that is having to insert while still menstruating...no tampons, if you prefer them. I am too scared things will get pushed out or lost if I use both.
Sometimes it does slip, but I have never lost it. All the advice about twisting the ring into an eight is right in my experience too.
And, my gyn said it can be taken out for three hours for sex, which I recommend. It may be psychological, but I just always felt weird that it was there during the act. Not sure I actually felt it, but I did a good job of imagining I did.
I really like not having to take another pill everyday...I have a hard enough time remembering those!