i've got the Comp-Tac Gurkha model for both 1911 and P228. nice holsters in the kydex selection out there. the designs are solid and perform as advertised. i'd like to try the C-TAC model as it seems an improvement over the Gurkha.
that being said, i've been carrying Glocks in a few Predator ITP holsters for the last 10yrs.
kydex can create wear on the high points as any other material. if you don't clean the interior out periodically, the grit can hasten that wear. however, you can use a little Armor-All to slick it up when you clean it out. go easy with that or simply wipe more of it out so it isn't "slide across the front bench seat" slick.
kydex is hardy and not much different than wearing a good leather holster. any flexing clips may wear out and crack off ofter several years of flexing on and off.
adjusting the tension screws, if any in the design, is a nice feature but can take a little time to dial in where you want it.
that's it for my rambling right now.....heh