I’ve got a Sierra AT4 with the spray in bedliner. The quality is good and I like the AT4 logo in the front wall of the bed. I’ve had a Linex after market liner in a previous truck. The quality and texture of the factory liner seems similar to Linex.
The only issue I see on mine is a few frayed spots along front edge where the bed meets the cab. Looks like it was masked and when tape was removed the edge didn’t come out perfect. If I decide to fix it, I think I can clean it up fine with a razor blade. You have to really look closely and from the right angle to see the issue.
I think having the Chevy emblem, AT4, Denali, etc embedded in front wall is a nice look. I’m not sure if you can get that with aftermarket. If you can get the emblem in the front wall of bed with an aftermarket application, it would just be a price/convenience question. Quality seems very similar to aftermarket.