My fiance has one. There were some teething troubles but after updates to both the Parrot kit and her iPhone all is working well. The phone pairs up when she gets in the car, plays music from her phone (you can also plug in USB sticks etc, she hasn’t) and if she uses satnav on the phone the music is faded down so the instructions can be heard then the music returns. Same for phone calls.
It all integrates very nicely & as she has the 9100i there is nothing visible in the car except the microphone up by the mirror & the remote on the steering wheel. I like it, wish I had one too.
Edit to add, as sound comes through the cars speakers it is good & clear. However I think the kit works by disconnecting your built in stereo from the speakers to kind of hijack them so you will lose RDS traffic announcements if you are listening to music over the Parrot kit rather than your cars head unit.