I have owned many trucks. My present truck is the first I have ever owned that has a Line-X sprayed in bedliner. It is fantastic. I am the third owner of this 2004 truck, and the liner is without flaw. I have seen other sprayed in liners that looked real bad. I would not hesitate to go with Line-X.
My TC is a Bigfoot which has a molded fiberglass bottom. I think it is slicker than any other TC bottom. I use two 3/4" thick Horse Stall Mat on top of my Line-X. One 1/2" would be okay, but I need to clear 5th wheel rails.