I cant really comment on the chemical side of things John uses or talks about as i have not read all his posts...
But when it comes to the Nuts & Bolts of Extraction machines themselves, Then yes... I can understand why many Suppliers & Manufacturers may well be "Cringing" lol
Think about it... Here is a man who has been kind enough to guide one & all with his gift of knowledge (im especially talking about the booster boxes here)... John has built Excellent Boosterboxes that take an ordinary Machine to close to Truckmount Vacuum Power for a Fraction of the cost of a Truckmount with his So called "MacGuyver Machines"... So, Why would he or anyone need to invest many 10's of thousands of pounds in one if you can pretty much re-create their power for less than £1000?
Dont get me wrong though... obviously Truckmounts are Excellent... But John helps & guides those who like to tweak & get the Max out of their portables, & i think thats Brilliant...
If John has said (i dont know...) That any certain extraction machine is poope... Then im sure their is good reason for it.
in my opinion he has taken the most Visually Badass Machine on the market & made its Performance even better & created Extremely professional looking Boosterboxes that compliment the Looks of the Enforcer Exactly & gives them Beyond next level power!
So... I think we should be thankful to John for his contributions... i cant wait to test out my boosterbox... the last components will arrive early next week