They scuff up your truck's paint with an air grinder before applying Line-X, so it adheres better. They also put plugs in your box drain holes, in my S-10 there are 4 of them, one in each corner. Once the Line-X cures, the plugs are removed, allowing the water to drain like it always did.
They also removed my tailgate, which allowed them to apply Line-X to the rear valence under the box, and also get complete coverage of the tailgate.
I checked out both RhinoLiner and Line-X before settling on the latter. RhinoLiner at the time had larger chunks of recycled tire in their application, which wasn't the texture I was looking for. Maybe they've since gone with something closer to Line-X in their consistency.
I've got a photo around here somewhere of my truck's tailgate and box. I've got to re-scale it before the resident photo Nazi jumps in my chili, but it shows the Line-X after about 4 years of aging in the Florida beachside sun.
I'd take more photos today, but I have to rinse the deer blood and fur out, first.