I have used NZ for 2 years now, but will be changing as soon as I can find another service.
Annoying advertisements interfere with the connection speeds.
Otherwise, it would be good. NetZero does allow me to do that, however, it constantly is opening ad windows and telling me I can click on the ad bar while I'm in the midst of other things. Also, my computer seems to freeze a lot when it's running. It'll do in a pinch, but I'm looking for something less obnoxious. From what I can tell it sends a bunch of ads before anything else.