Flawless!
This thing works great!
I've been using an FM transmitter in my car and the sound quality is just horrible,
I saw the XCarLink and thought, "what the heck".
I bought a refurbished one and it didn't work. After emailing customer service they said the would send me a replacement. I asked if I could just drive up to their shop since they were 10 minutes away and they said no problem. I was in and out in a matter of minutes (nicest dude you'll ever meet). Got home, installed the new CarLink and it's worked ever since.
The aux cord works, and you still have control of the CD player when you're not using the XCarLink.
I've never taken apart my car to do anything, and through youtube and the rest of the interwebs I was able to install this thing with zero problems.
for a guide on how to take apart your head unit, check out this video.
http://youtu.be/sG77cRRaWPM