Wear & Tear

A dive computer is subject to a nastier environment than on the trails. Was wondering how everyone's Descents are coping with being crushed between cylinders and whacked on boat railings and ladders etc. Have the Titaniums worn better than the steels? Is the bezel replaceable (or does it take off the screen like the Fenix 3). And are the actual watch bodies the same (ie, plastic composite).