looking at the Amtech website now ... they seem to have reverted to twin 5.7 in all but the cfr500 ... last year most of their machines had a single 6.6 .
This was a dreadfull imposition by the american powerflite makers on amtech .... as all their Uk competitors were selling twin vac machines .... amtech were suppose to compete by selling a single vac ?
The black max mentioned above looks like quite good value .... considering its good a good heater built in . Should perform well if you use your portables close up .
But would it be as good as twin 6.6 Enforcer or storm with external heaters , two inch plumbing and hose etc ...
sadly no ... but still a very usable machine
like mentioned above , the team at Amtech are a polite ,professional joy to deal with , just wish they had machine with UK build and spec to compete with the best offered .