Pros: -plug&play: took me under 1 min to connect it to my iphone and listen music over my car radio(so A2DP works)
-sound quality: does nearly reach normal cd quality over usb/sd/aux, bit worse over bt, but in a normal range
-
-handfree function: great! works really nice, also at higher driving speeds, although i havent found a mic at the part yet ;) also remembers your bt connection.
-dialing via remote: you can dial numbers via the remote, save numbers for speed dial or recall the last number, no need to grab your phone

Cons: -instructions are a bit short, just explains the buttons. Havent found out how to store numbers for speed dialing, but just tried it once
-my include aux cable got a little loose contact, used another for better sound quality
no more to find :)

Other Thoughts:

Bottomline: must have for everyone how wants to have a handsfree option for his car! easy to use and good quality!
would buy it again immedatliy!

Pros: Works out of the box, ok sound quality. switches nicely between playing music and phone. easy to use.

Cons: limited to 2GB SD and 511 songs on USB. Does not display full song name.

Other Thoughts: if you don't need the handfree BT option and just looking to play music, buy the http://www.dealextreme.com/details.dx/sku.10130 it is much cheaper and can handle many more songs on SD (I tested with 4GB, but there are reports of working 8GB)

Bottomline: buy it if you need the handsfree option, you've got a quiet car and you can live with limited number of songs.

Pros: - It's an SD / USB / 3.5mm jack / A2DP / AVCRP enabled FM Transmitter. It's practically all possible ways to connect an audio device to it.
- A2DP + AVCRP means you may be able to stream your (most modern) mobile phone's audio to it wirelessly -- and control it from the FM Transmitter.
- Speaks numbers in English or Mandarin when you press certain buttons on the remote, so you know you got the right numbers without really looking.
- The aux cable is actually separate (a socket on the side of the transmitter) so if you don't need it or you need a different adaptor, there's no wire hanging out / just one wire without adaptors. Plus if you damage the cable, you don't need to replace the whole thing.

Cons: - Transmit power could be a little stronger, IMHO.
- Rotating Hinge feels weak. I would have much preferred they leave it out. Definitely do NOT pull on the bulb part when removing this from the socket -- grab it between the socket and the hinge!

Other Thoughts: - my remote came with the CH+ and CH- buttons reversed. No big deal... probably could fix it myself.
- would have preferred it automatically resumed what it was doing last (at least with bluetooth), especially on phones without AVRCP (can't control on FM Transmitter).
- came with battery.

Bottomline: Definitely worth it, despite the drawbacks.