My friends have a his & hers '18 (special red & special grey). Only issue they have had so far is
paint flaking off on both specialty colors (problems with the special Mazda paintjob process). The regular non-4-layer colors don't have that issue. So that's something to consider, especially for resale value, even if you're able to get the car resprayed, which is very difficult to do right now as there's no official program in place; they were only willing to give them touch-up paints. The new Kia Stinger had the same issue & ended up having to shell out for new paintjobs on all affected cars.
If you are set on getting one of the special colors, then I'd recommend getting some kind of paint protection put on. XPEL is crazy expensive, but you can go the plasti-dip route for quite a bit cheaper. Not quite as strong, but still does a really good job. Plasti-dip or "liquid wraps" have come quite a long way in the past decade; there are now specialty companies that sell sprayable liquid wraps in different colors & finishes, including special clearcoats specifically for spray-on paint protection. So rather than going with a PPF (paint protection film), which can be like two grand just for the front nose, hood, and side mirrors, you can opt for a more cost-effective route with a full-body liquid wrap like Autoflex's Spray Wrap Pro X. Again, not as strong as PPF, but where there's a known paint-chipping issue with the special 4-layer red & grey Mazda paints, it's something to consider if you want to get one with the cool paintjob!