Only thing I'd like to see addressed with the Angel 1 is fixing the two common weak points:
1. Make the ram serviceable/rebuildable
2. Ditch the roto-breech and eliminate the breech pin/ breech seal issues.
Oh and an externally adjustable lpr would be nice too.
Do that and it'd be the perfect marker.
1. Do you really want to deprive Jon of his cake? Seriously though, the issue with the ram is the front o-ring, its tricky (removing the loctite'd and grub-screwed hammer from the ram shaft) to get at but it is serviceable. By the time anything else needs doing its worth replacing anyway.
2. The roto-breech/pins is only an issue if you let it fly open, the breech knob can be shimmed with a small o-ring if it is loose, and this only really affected some early 1s, once replaced the seal rarely goes again, if done properly, and the gun can be shot without it. Better imho than a bolt pin wizzing back & forth in front of you.
The LPR doesn't need that much adjustment, pre-mago I never had to readjust it, come the magno (I had one of the very first kits) I played with it dropping the pressures to see how efficient I could make it, I got to 14 pots on a 4380psi fill. It is a little more sensitive in magno's 1s/Flys and can run slightly lower in the summer than the winter, but the winter setting will work all year round. Hardly anybody ever takes more than 6 pots and a hopper on field these days so the slight drop in efficiency isn't really a big deal.
Both my A1's date from 2006 and have lord knows how many shots on them (the counter zeros everytime you update the software. Both are Magno's, one has a Rabid board and a Raguba trigger, both work fine. The older 1's don't have as good a manufacturing tolerance as the Flys but do the job.
The only real issue I ever had was with self destructing exhaust valves, but that's been fixed.
APS have gradually upgraded and improved on the platform, rather than the continuing helter skelter of new gun releases, up to the introduction of the 1 it seemed like they had a new gun at virtually every major event you turned up at.
As for getting shot out on the gun because its a 3 tube design, piffle, if you get shot out on your gun its because you or your gun were in the wrong place at the wrong time!