Hey there,
I have the factory connector in my NC. Some gripes:
- doesn't always recall where it was up to; sometimes if you leave the car for a while, jump back in, and it starts playing from the first song on the first playlist again (haven't been able to consistently replicate this, so not sure what causes it)
- works with iPhone 3G, but doesn't charge iPhone 3G (old connector with different pins, however you can get an adaptor). Cool thing is the phone rings through the stereo while playing, so if you have a Bluetooth headset you can answer the call, complete the call, then the iPhone will carry on playing music where you left off from. I usually have my iPod connected into the adaptor, though. It's a 4?G one, so it charges.
- Largest gripe? The stereo display, despite having a dot-matrix LCD, does not display any text information from the iPod. Disc changer buttons toggle between play by album/playlist/artist/genre etc, but you have no way of knowing what mode your in unless you can memorise the order in which the stereo toggles through them. Furthermore, you cannot choose music on the iPod while it is connected. The only way around this shortcoming is either A. unplug iPod, start playing from album/playlist of your choice, then plug into connector, or B. don't care too much, just stab buttons at random until you hear something suitable. I use both these methods depending upon mood
Sound quality? Well, i rip everything in Apple Lossless, and against a CD, there's little discernable difference. Thing is, it's an open top car, it's not the ideal acoustic environment anyway. The BOSE system does an exceptional job despite this IMHO.
All in all, most forums seem to recommend the Audiolink aftermarket solution, it at least enables you to select tracks on the iPod while it is connected. There have been some reports of issues with the steering wheel controls with this connector, however only some report this.
More info in this thread:
viewtopic.php?f=18&t=31762