SunTek doesn't apply well to our cars.I put PPF (Xpel) and ceramic coating on my 2014 Shelby. Five years later and 20k miles it still looked like it did on day 1. I took the car everywhere, it was not a cars and coffee only ride. I experienced no yellowing, washing was quick and easy, nothing stuck to the car, and everyone commented on how rich the paint looked and great it felt. I did return the car to the detail shop annually, before winter, for a touchup and did have one of the rocker panels peel up (where dirt had built up). I was charged a small fee for the whole checkup but any film that needed to be replaced or coating reapplied didn't increase the fee.
I traded it for my 2020 and I plan on going the exact same route. I will be going with a different shop and SunTek instead of Xpel. I have nothing bad to say about Xpel quality, I saw plenty of nicks on the film that didn't make it into the paint. It's more about the install. The shop that did my Xpel didn't wrap the edges and years ago I didn't know enough about it that it would be an issue. The shop I'm going to now custom cuts all their film. They've shown me a few cars (including a beautiful C7 ZR1) where they wrapped the edges so seamless you would have thought it came that way from the factory.
I charged more when I sold my 14 because of the PPF and the new owner agreed to pay for the increased value. Sometime in the future I will repaint the bumper on my Boss and get that wrapped as well.
So yeah, to me, it's more than worth it if you're going to keep the car a hot minute and for the resale value retention if that matters to you (it didn't to me but it was nice to have, I don't keep cars for their monetary value).