I bought the iTrip at Best Buy after reading the reviews. It worked fine the 1st time I tried to use it. It found a clear station right away. When I tried to change stations the + button didn't work so I had to use the - button for everything. After the 1st week, it stopped turning on when I started up my iPod. I went to the Griffin web site and downloaded tips. It turns out I have to soft boot my iPod 4 - 5 times just to get the thing to work. I threw it in a drawer and bought a monster fm transmitter. It has been working fine for 2 months now, the iTrip was a waste of money.
Griffin Technology - iTrip is not recommended by imallbs