My 18 TA 392 was coated with Cquartz I think it was pro, not sure. Car sat outside in the elements and I daily drove it 52,000 miles through 2 PA/MD winters, so ash, salt, brine etc. I washed it as I could in winter with touchless car washes and hand washed it with the Cquartz soap whenever the temps would allow. In summer it was once maybe twice a week depending on rain. Every third wash used Ech2O spray to "restore" it. It lost some beading on teh rear and rear parts of the fenders and lower doors where most of the dirt goes but overall it still beaded well. The main thing was the paint still looked fantastic when I traded it. Would I get that with wax, maybe, was it a lot less work, YES, was it worth the $1200 probably not since I only kept the car 2 years but I dont regret doing it.
Did it to my 1320. 18,000 miles and 2.5 years (garaged this time) and the paint is still amazing, car still beads like crazy. YMMV.