Just read this again, Opti Coat protects environmental stuff, bird poo, pollen, water spots, UV damage. Xpel is there for impact protection from road debris and rocks.
I just installed these on an MS for the first time. Took 3 hours, I think I could do it in 2 next time!
They looked good! Barely could tell from 5 feet away they were on the car! And from my own experience working on over 140 Model S cars almost everyone with 21's curbs them with in a couple...