You're wasting your time, mate.
All of the Powerflite guys will tell you theirs is best and all the Enforcer guys will do the same.
At the end of the day they are pretty much the same thing with a few minor differences.
I've got two twin vac extractors, an upgraded Rhino and Prochem 2000 Powermax, both good machines and get the job done.
I trialled one of the above and after all the hype thought it was beyond disappointing.
Simon