Summary: I have a Volvo XC90 without an auxiliary hook-up. I've tried every transmitter to listen to an Ipod on long trips and they all have pretty much sucked. I read the reviews on this device, but found a cheap enough version for sale on EBay that I figured it was worth a shot. Drove from Denver to central Illinois yesterday and was very impressed by this product.
Summary: I've been using mine for more than 2 years now and love it. I live in a rural area (Eastern Oregon), so I have more open frequencies than an urban area would allow. An older review mentioned removing your car antenna. This seemed to help a lot, although now I can't listen to my local radio stations which are awful anyway. I drive a 2003 Jetta TDI.
Summary: This one works well with my gen6 iPod. Can automatically scan for a FM channel that is open or weak enough to allow your iPod to play back thru the car's radio. A great feature when driving a long distance. Cable length is enough for me to route it in my center console keeping the clutter down. The 30 pin connector is very similar to the standard Apple cable allowing easy plugging/un-plugging. Good sound quality.
Summary: This works great I've had several over the years. My last one quite working after two years I guess that's not too bad. I love it for my 4/4S but am thinking about buying an IPhone 5 and wonder if it will work with that one. Otherwise love it. Oh by the way I live way out in the country so I don't know about big city use but where I live and the medium size cities around me it works great.
Summary: I came here looking for a link to this product so I could recommend it to someone. I can't believe the bad reviews this product is getting! I live in a city and get great reception using this. The sound is clear, and the charger works perfectly, even with the iPhone in an Otterbox. (It is VERY rare to find any accessories that will work with the Otterbox.) Also, I've had little if any difficulty with overcoming FM signals. If it starts to fade, hit the button.
Pros: Ease of use, clear sound, bright display, charger fits iPhone in Otterbox
Summary: The tape deck in my car finally died so I needed another way to listen to iPhone through my car stereo. Some observations: I bought this while knowing full well it was not going to sound as good as a full Aux-In port (which I lack) or Cassette adapter. However, the device works remarkably well with slight interference. Interference from overhead power lines seems to be the biggest annoyance.