The only reason I mentioned the 500 pump could be dodgy is there have been several postings on here saying so over the past year on various models
Ashbys just buy the bodies and configure the machine themselves so you are not buying same product from the states
When i looked last week Ashbys had a recondition 135psi machine for £1000 with 3 months Guarantee.
You would need top ask what has been replaced.
I think they put in new motors and pumps but could be wrong.