I didn't bother with a bed liner, spray on or drop in, but I'm thinking about a bed mat just to protect the floor and keep stuff from sliding around. The GM-accessory one seems decent enough in pics-haven't seen it in person. I like the Weather-tech design, the way it wraps up the sides of the bed a bit, but it's not yet available for our trucks. Anyone tried the dealer-accessory version or an aftermarket one that could offer a recommendation? Thanks!