Myself and hunting partner did an backyard test. We tested grims, rage, jackhammers, against the G5's we have shot for years.
Only mechnical that held up in the destructive test - shooting through 2 3/4" plywood was the jackhammer.
Accuracy all was fairly close.
Ease of use, beside the G5 was the jackhammers, no rubber bands, did not open premature.
When tested on elk, well it was the first elk I shoot that fell within sight.
Outside of a horse is good for the inside of a man.