Summary: I'm on my second one! It very easily comes out of the iPhone socket. It doesn't lock in. For the few first months it stays in place but after a little bit of use (I don't even drive everyday!) it starts slipping off! I got my first for 80 dlls at the AT&T store.
Summary: Horrible. I suppose this might work adequately if you live in an area with few radio stations, but in a city it is impossible to find a free frequency for more than 5 minutes. Doesn't work at all.
Summary: My other half bought this for me as the cd player in our car isn't working. This one was recommended as being one of the best, most powerful (and most expensive - cost is $100.00 where we live) one on the market.