I haven't got anything yet, but I'm planning on the spray in Rhinoliner when I get around to it.
Several of my friends have it and it looks great, much better than the removable liners, and it really holds up well. I'm not talking about occasionally hauling stuff in it either. I'm talking about everyday use, from ranch work to hunting to the tailgate parties after the softball games on Monday night.
I'd recommend it to anybody.