I had my Stinger coated with
Crystal Serum Ultra, ceramic coating (professionally done).
I think the biggest part of the process is what they call the 'paint correction' aspect, and then they apply the ceramic coating once that has been completed. I brought mine in the week after I bought it, and upon doing my research, I had many questions. I found a guy in my area who had a good reputation online, he had a nice website, and many videos detailing the process. He has done many cars, Tesla's, Ferrari's, Porsche, you name it. I was initially confused about the paint correction, and he explained to me that between the factory and dealer, there was already improper washing technique that had been done, and even showed me the tiny 'swirls' in the paint that were already present from either the initial manufacturing process, washing, or both.
I went ahead and did it, and I am very happy that I did! It really made the color pop a bit more-it almost looked a bit darker since you no longer have the light refraction from the inconsistencies in the paint (Hi Chroma Red), and there were no more swirls at all. I had committed in my mind to making sure I wash this car carefully moving forward. No car washes with brushes or anything touching it. I either wash by hand with the water-less washing technique, or I take it through a touch free wash. The biggest thing that I notice is that not a lot of gunk sticks to the car. Like someone said, it is a very slick coating and water just beads up and rolls of the car. I am sort of a fanatic with keeping my car clean and new looking, and this makes it REALLY easy to care for her. I got the whole car paint corrected, and ceramic coated. I even had the wheels and calipers done, and had him apply a treatment to the windshield (similar to rainex) which has been really awesome. I live in snowy Minneapolis, and it has been a breeze keeping my car looking really sharp. I get SO many comments on my Stinger-people giving me the thumbs up, stopping to talk to me in parking lots, tons of heads on swivels.
In my opinion, the biggest thing about coatings is the paint correction being done first. When you coat, whatever is underneath is sort of 'locked in'. That was reason enough for me to go the professional route as I do not have the proper space, let alone the patience required for such a task. Not sure that it matters so much the brand of the coating, I honestly think that it is the person who is applying it who is going to be the biggest factor. Take your time, do your research, and find someone in your area with a good reputation and patience for this type of work. It is not exactly cheap ($1,500 for all that I mentioned above)-but I feel that it was 100% a solid investment. Better check back in 3-5 years to be sure though.