Summary: I installed this (with the help of my brother) a couple of weeks ago and really love it. The sound quality on my end is fantastic and the microphone picks up my voice quite clearly. The installation was fairly simple, mainly because I also got a wiring harness. The only complication with the installation was knowing which mute wire to attach to but I got lucky on the first try. Absolutely no problem connecting my phone to the system. There are a few irritants with it.
Pros: Great sound quality on my end, fairly easy installation, easy to use
Cons: Echo on other end, menu system not that great.
Summary: The device works pretty much as advertised. It has a hard time with my Verizon Blackberry Curve, For instance it pairs ok once, but then forgets it was paired the next time the car turns on Also, the sound quality is a little wonky on the recievers end and staticy inside the car. However my old Tmobile flip phone connects flawlessly every time and sounds crystal clear...
Conclusion: Easy to install, nearly plug and play. Sometimes the unit 'hangs up' and the phone takes over your radio and you can't do anything but make a phone call. The way to solve that is to basically reset the unit by turning your car off and then back on. I use mine on a BMW E46 sedan and it integrates perfectly with the OEM steering wheel controls and radio.
Conclusion: After several other bluetooth kits, this is the best so far. The ones that I've owned in the past lacked audio quality, mic reception, and/or bad user interface. The Parrot kit has none of these issues for me. The only issue is that the audio quality is a bit screechy, but not too bad. The user interface is simple as can be and the recipients of my calls all tell me that they hear me clearly.
Summary: The hardest part of this installation is the removal of the radio and that wasn't hard with the instructions supplied by Crutchfield. The control box is kinda big and in some installations it might be a challenge to hide but it's not fussy and zip ties are your friends. I removed the pillar trim to hide the mike wire and make a sanitary installation; it looks good. After that, it's plug and play if you have the optional wiring harness.