Frank,
I've souped up my Volkswagen Golf to get 500 miles to the gallon. It's amaaaazing!
Now, do you think you have to have personal experience driving my car, before having any reason to be skeptical? Would I score points against your skepticism by complaining "But you haven't TRIED it for yourself, so you have no grounds to poo-poo my claim!" ?
Remember the old adage: Keep an open mind, but not so open that your brain falls out. Right?