Well, my Nuvinci hub it a real pain to deal with when I get a flat, although I believe all my issues have been dealt with in the newer model. It looks like the new model has a fairly simple way to remove the cables when you need to remove the wheel, which puts it on par with other hubs.

That said, I love it, and whenever I think of replacing it, the thing the tempts me most is simply the newer model of this hub. Moreso than other hub gears, the Nuvinci does add significant weight, and I carry it up and down stairs daily and often load it on the front of the bus, but the weight doesn't bother me much. Even less-so when it's rolling.

I think an IGH is fine for a commuter if you're comfortable with it. My Nuvinci bike is my commuter, and my back up bike has a 3-speed hub. Even with the 3 speed, it gets the job done.