I've owned 2, the Challenger in .30 and the Backpacker self-auto in .22. I like the Challenger! It's very accurate with JSB 44.75 and 50.15 grain pellets, and after a little trigger work is a great hunting rifle. I didn't much care the the Backpacker. It was an early version and did not automatically cycle if filled over 2500-2600 psi, even though it would hold 3400 psi. The trigger was much heavier than the Challenger, which hurt accuracy when trying to do quick follow-up shots. Otherwise, it was accurate and light weight, just not for me. So, from my perspective, AEA makes some nice air guns, it just depends on what you are looking to get from them. I felt if the semi-auto had been regulated to around 2300-2400 psi, so it would function properly from a full 3400 psi fill, the trigger would have been tolerable, but manually racking the action for every shot until you were within the range where it would cycle as it should, or never giving it a full charge (at the sacrifice of shot count) was more than I wanted to mess with. Maybe the new model has addressed this issue and works (cycles semi-automatically) at a full fill now, and if so, then it might be worth considering.