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I would take the word of an end user over the word of a salesman.
BOY OH BOY go I AGREE WITH THIS STATEMENT.
I have had so many sales reps from companies 'tell me' that a product that sell is AWESOME...so I get a small test sample and see for myself BEFORE I actually use it on someones car. Many products have to go through a barrage of tests and abuses to see if it all cracked up to 'what they say'.