Well whats good?...Well Everything. The reg is bullet proof. Unlimate in reliable. Completetly rebuildable which is important for tourney play. I have had 4 apoc units for about 5 years and they all still work perfectly. the 4500 psi models tend to be harder on reg seats, but I have only had to replace 2 or 3 of them. That's better than having to send it off to have it fixed...("cough" "mania") On off valve rocks. and for you guys having trouble turning yours on and off....try not mounting it to where the set screw on your cradle does not sit on top of the on off assembly. I cant say enough good things about this system. If you can afford the big price tag the choice should be clear. The only real downfall to this system is the lackluster support AA provides.....this company is almost non existant.....you cant even get someone on the phone. But its not really a problem though because if you can rebuild a mag you can rebuild and Air America Reg. Parts are also not a problem to get....any automag rebuild kit will work.
Customer Support is poor. Distribution is also poor. It's next to impossible to get their products some times.
The AA Apoc system is by far the best HP system on the market. Im rating this system at a 9 only becasue their customer support sucks so bad. Other wise the product would be a 10. How well you stand by your product is as important as how good your product is. Despite this I still heavily recommend their product.