I purchased a Casio G-shock 5-11 series watch with a black resin band about 1 year ago. After wearing the watch for about 9 months the watch band began to disintegrate- first the loop that the loose band end tucks into broke, then the plastic loop that holds the clasp tore, and the clasp fell off. To make matters worse, Casio no longer makes a replacement band that fits this watch. There a many different watch band designs for G-shock watches, so it is difficult or impossible to get replacements.
The watch works still, but overall, shoddy design of the band. Very poor customer support.
My advice- don't buy G-shock watches, or if you do, get something other than the resin band.