I have used this in a limited capacity, since I have only had it about 3 weeks. Stationary with a decent 3G signal (>3 bars), works great. Going down the road, or stationary with 1-3 bars it is still pretty good.This is on a tube type tv, so changes in resolution aren't that apparent, and occasionally the video stops to buffer. On an EDGE network, even with 5 bars, the connection is just too slow. This is with the composite ( yellow, red, white) with an iPhone 4. Plus, if you have digital copy DVD's or Blurays, MPEG's, etc....then you can store them on your iPhone or iPad and play them as well.
For audio, it works great. Didn't even think to try Pandora on the EDGE network....