I have xpel ultimate on my cayenne only in bra configuration and llumar platinum on my mclaren with the entire front end and rocket panel. I wouldn't buy a car without it. I would recommend doing the entire front end and rocker panel. The whole car is probably not worth it unless you have matte paint.
Personally, I like the llumar platinum better than the xpel ultimate. Xpel is nice, but too thick in my opinion.
3M has a mixed reputation. They make some of the best stuff, but different individuals I spoke to stated their older stuff had some issues and their newer product hasn't been around long enough.
Good luck!
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