Why couldn't you just put all those posts in one large one with a few lines in between each quote? It would make it alot easier to read.
I don't have experiance with either, but my uncle has a Line-X and he loves it. It looks like it did the day he got it. It has held up well and it gets ABUSED. Trannys, engines, axles, chunks of metal, anything you can imagine has been flying/ bouncing around in that liner for about 5 years now. As far as I know, no chunks have fallen off either, still stuck on everywhere.
EDIT: If you get a bed liner, do the over the rails one. The tops of the bed get beat, especially the top edge of the tailgate. My uncle said that is the only thing he would have done differently. Instead of just going under the bed sides, he wishes he'd have gone over them too.