The trigger is single stage and easy to get used to or you can mod it to get a fake 2nd stage by swapping the trigger stop with a plunger screw
Shot count with a huma regards fitted can be more than you expect, in standard single tube/cylinder I can get 80 shots in 177
Build is belt and braces and never missed a beat ....
As Figgy says is compact for a backpack ...mine fold's down to 14" × 9"
You could zip wire back down that 🙂