I’ve had worse luck than most with those guns. I would suggest finding an alternative, or getting one of the simplest lowest powered guns that would be unlikely to tear itself apart.
I could not get HP max 357 to hold air for long, even after return for service. Was sent a replacement that had the same issues. The valve seat broke every hundred shots are so. That was returned and the third gun which is still have is a .25 carbine.
Neither gun looked brand new beneath the surface, in the sense that there were odd parts that looked used and didn’t match the diagrams for the guns - for example, a worn flat head screw where there was supposed to be a hex nut according to the repair video, weird, fragile prototype part were the guage attached that needed updating and so on
The .25 Hp carbine is accurate and fun to shoot, and better put together than the Hp max. I enjoy this one. Unfortunately it has fragile valve pins so you will need extras and the semi auto mechanism tends to jam unless specific pellets are used.
I just got a Kral empire xs for a bit less than the price of the AEA guns I have… night and day in terms of build quality and attention to detail. Feels like a design that has been tested and refined carefully and the AEA guns i have handled are not there yet. For example, it uses the same mechanism of magazine as the AEA but they are designed to be much more pleasant to load. AEA mags are slippery and tightly wound… you get used to it, but I will occasionally loose my grip when loading the first pellet and the spring sends it flying.
My advice, which is heavily biased by my experiences, would be to wait until some third or fourth iteration of these guns comes out.
I have limited experience compared to many here… I’ve used airforce, hatsan, Kral, AEA. If you are looking for a .25 non semi auto, a Kral empire x or xs is a much much nicer gun than the AEA’s I have handled and also for about $500-$600