My Line-X experience was mixed. I had a '08 SD SB sprayed in '08 with standard black.

CON: I had asked that they Line-X the tailgate step, to replace the grip tape. The salesmen seemed like a great guy and in true salesmen fashion said no problem and would include it the cost in the price ($450). When I returned to pickup the truck, they had not Line-X'd the step. He said bring it back and we'll take care of it. Something like we ran out of time, blah blah blah.
I set up an appointment to finish the Line-Xing of the step. blah blah blah.... it was too much of a pain in the @$$, he told me. Lesson; salesmen are salesmen. Get it in writing, otherwise I would have followed up Line-X customer service.

PRO: I loaded 3K lbs of tile on pallets. They repositioned the load with forklift and absolutely no marks or scratches. I been very impressed with the quality.