Check out their site and look for comparisons and testimonials. Take what you will from online customer testimonials but there is one where a whitewater rafting company sprayed 303 on half of a life vest, threw it on the roof, and forgot about it for quite a long time. The untreated side nearly disintegrated while the treated side still appeared functional.

I have used it exclusively for a few years and it is fantastic stuff. The interior of my W220 S430 has this strange "soft touch" coating on some of the interior panels and buttons. (Headlight switch surround/steering wheel buttons) This coating picks up anything that touches it, including body oils, which makes them wicked sticky. 303 actually does a nice job of cleaning and protecting them. Everything else I've tried just adds to the sticky mess.

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Best Regards,
Sam

'76 280 Time Capsule
'00 S430 Long Trips
'91 190E Seeing how far it will go. 366k
'04 American Eagle Motorcoach