I bought one, which i sold after a week. Just beceause it wouldn't work in my car. It was due to the fact that my car has it's antenna in the front, right next to the licenceplate <which i didn't know until i bought the itrip>. This resulted in almost no reception in the car. And in my house, with an ordanry FM radio, the quality was something between poor and very poor.
An other issue, when i disconnected the antenna in my car my radio searches for the strongest signal while you drive, as a result of this, it picked up the iTrip signal, but while driving the radio picked up a station now and then, which disstorted the itrip signal.
All in all i thought it was a pretty poorly gizmo -for the things i wanted to do with it- being listening to music in my car.