My girlfriend got me a iPod for my birthday, I bought an Griffin iTrip the weekend after. So here is what I think of it.
Cons: Changing the station was not intuitive. I had to end up watching the video on the website to figure it out. Finding a station that is good in your area can be difficult.
Pros: It easy to use (now that I have seen the video). I can easily change the stations via the iPod. It just works. Its sexy.
Overall: Love it.