They all have a milky appearance and similar smell. I think what most people didn't like about Armor-All was the oily appearance it left, they have changed the formulation, though it is still too shiny for my preference. My uncle bought a house that hadn't been lived in for many years, as we cleaned out the garage, I found a bottle of original Armor-All. It was still a usable product, and curiously enough. The small white plastic spray bottle was in perfect condition. After God knows how many years of sitting on a sunny window sill, the formula within, kept the bottle like new. Other plastic items in the garage (Frisbee, cup, etc.) all shattered easily with little force. I don't feel the price of these vinyl protectants is too extravagant. And anyone can agree that vinyl/rubber/plastic does look better after an application. How do I know they work? My dad has a '93 Nissan pickup that has never had protectant used, his inside door pull has hardened and cracked. And I'm afraid to roll down the windows due to the scraping of the hard rubber against the glass. My previous car was lovingly cared for, it was OLDER than his truck, and had no hard/cracked vinyl anywhere. I've been using Vinylex for years in my Mustang and on its convertible boot. I believe it cleans well and I like the look, so do members of the local Mustang club. Why assume the manufacturers are deceiving you? Go to a car show and look at some 50-70 year old cars, I'm sure a list of products is to thank, for their like-new appearance. A study would not help me, I would still buy Vinylex. I know there are UV repelling ingredients in the formula, and I trust the makers claims, and I like the look it gives my tires and interior vinyl. I used 303 previously and also believe in its protective abilities, I just found vinylex to be a stronger cleaner. If I don't have vinylex, I will use 303. In the end, my own experiences with products I believe keep vinyl/rubber/plastic healthy and like-new, are the reason I continue buying them.