They are just for looks UNLESS the piston diameter is larger. The best upgrade is look for a caliper with twin pistons. They spread the load, and create more surface pressure due to more area.
I found the Agility has a twin piston caliper, and my ZX had a single piston. I swapped them out, and have much better response.
You might find another scooter that has twins, and you can strip that one down to send it for anodizing. The process is generally under fifty bucks for a part that size.
