I got my Nuvinci hooked up about 50 miles ago - so far so good, I love it.
I had a fantastic experience dealing with Fallbrook Technologies after I damaged the shifter connections on the hub during the installation. I explained what I did wrong, and they immediately mailed me about $30 of replacement parts, without even charging for it. http://motorbicycling.com/f3/fallbro...ome-14825.html
So I've been really impressed, they definitely stand behind their products!