I had the official Audi front and rear UTR fitted. Took the dealership ages to do it because a load of trim clips snapped and they didn't reconnect one of the data cables to the centre console properly but it's a decent job in the end. I was keen to have it done by Audi to avoid any warranty issues.
It seems to work well. The Android app is typical for Audi and a bit under developed but it does the job.
Hi, I had the Thinkware 770 front and rear camera fitted. Bought from AVR Mobiles, they did a great job of coming out and fitting with concealed wiring. Has been working great for 9 months since fitted