Have a friend down here that did his. He’s had a few cars done before. Swears by it for protection, less washing etc etc. I wanted to, but haven’t so far. Does your friend normally do paint correction and apply ceramic coatings? I may be interested soon if he’s good. A lot of benefits I hear.
I didn't ask about paint correction since mine is a new truck but I'm assuming so. He has two dedicated guys that go through the entire process. They first deep clean (I'm assuming if you need paint correction, they'd do it at this step) the entire truck until they are both satisfied. Then get started on the Ceramic coating. From what he was telling me, they use a really good product. He quoted me for the entire job to be $1200 and that was for everything (entire truck + wheels). They take off your wheels to hand do the process so from what I can tell, they are pretty legit.
For protection, it is mostly for paint for swirls and light scratches. The PPF stuff would give protection from rocks, deep scratches, and door dents. A lot of them have a self-healing layer as well unlike the ceramic. He told me a lot of people get ppf in the most common areas for those aforementioned issues and then ceramic everywhere else to keep the paint nice and clean.