I think if Ashbys have brought a new machine onto the market it would have to be a totally new concept as there is fierce competition now with the Airflex.
I have an Ashbys (old machine) which I use as a back up. Two hd vacs and 300 psi Stinger piston pump. It's a good all rounder as a back up and the Stinger is a good pump and motor combination. I don't know why Ashbys did not fit this to their machines.
I used to have the 400 psi Ashbys machine. It was an abomination. Why? Because they could only get a small motor to fit into the machine to power the Pumptech pump.
Every 3 to 4 months the pump and motor would fail. Pump seals leaking and motor bearing housing wearing out, if not the capacitor. It cost me hundreds in maintenance.
Then I called Pumptech in the US to find out what the problem was. They said that the motor that is fitted is not substantial enough for the pump. Hence, the bearings wearing out due to load from the pump is causing the problems.
In other words the 400 psi machine had been designed wrong :

Now on other machines you will notice that a 1.5 horse power motor is fitted to the Pumptech pump....a BIG motor that is in the Airflex and other machines. This combination lasts for perhaps a year till is needs servicing.
I hope if Ashbys have a new machine it will be designed right.