Mine is missing bits after only six months. I wear it as proud testament to fine craftsmanship.
my plus 8 is now 7 months old and has just lost its first bit of blue enamel. My view is that the enamel is applied as a thin coat directly onto a highly polished chrome surface which cannot be good practice. The enamelled area should be grit blasted first to ensure adhesion. I plan to get mine changed under warranty.