I done a little bit of research before choosing this particular model and what I found was that along with the GTA kit, Integrated Automotive was one of the better options available. I'm certainly no audio guru but IMO the sound quality is no different to streaming audio via bluetooth under normal conditions.
The carplay kit connects with your phone via bluetooth or the additional USB cable that I ran from under the centre console / transmission tunnel into the centre storage armrest.
I literally installed the kit, had a quick test run and parked the car in the garage so I haven't had any experience with it as of yet. Tomorrow, I'm off for a three day blast around south west Scotland (with another 25 cars) so I'll have a good few hours of carplay under my belt when I return, I'll report any pros/cons.