Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Functional, but not great

This product will charge your Zune in your vehicle as described. The catch is that if you attempt to play your Zune while charging, you'll hear a loud hum in the background. As I've tried other chargers and had the same issue, I believe the blame lies with the Zune itself. I also have an Ipod and you can simultaneously charge and play it without the hum. The Zune may be superior to the Ipod in several ways, but this simply isn't one of them. So, buy this product, but unplug the Zune's audio cord while using it, and plan on listening to the radio.