We have had our ATC for only about six months, so I can't give you much insight on the longevity aspect, but I can tell you we love it!! We ordered a
custom Panther shell that we picked up in October of last year.
Before we made our decision we visited both ATC and FWC and reviewed their respective product lines. Basic builds are very similar with only minor variations in materials. Like you, we also have a full size short bed pickup.
Price wise ATC is a little less expensive, but that's not what swayed us. What was the selling point for ATC is that they will build exactly what
you want. Not so with FWC.
The guys we purchased our camper from are the same guys that built it. Jeff & Marty's names are all over our rig and they stand behind their work. Little things like TIG welding of the frame by Jeff who has been building these campers for about 40 years, as opposed to MIG welding by an unknown assembly line worker. When we picked up our camper I requested an additional seat cushion to fit our custom bench. Jeff pulled out his tape measure, scribbled a note and two weeks later a custom seat cushion arrived at our door. No charge.
We vacillated between a Ocelot and Panther for sometime. Ocelot is 78" wide (2" narrower than the Hawk) and the Panther is 84".
Our main concern was that the Panther may be too wide, but when it came down to it, the extra six-inches in width make a huge difference in practical comfort, so we chose the Panther. No regrets at all. We're running a 2000 Chevy 1500 with standard mirrors and have no visibility issues on the road or in a shopping center parking lot. Since it's a shell model it's super light weight for its size, coming in at 790lbs. Installed a set of Firestone Ride-Rite air bags and she handles just fine with no other mods.
Go visit Jeff & Marty, you can't go wrong with ATC