It always boils down to price vs value. The less expensive product is not always the best value, in fact usually isn't. That is assuming the product price isn't inflated just because of the name, think designer clothing. In the case of car chemicals, Adams is a great value for the price, and while more expensive than the auto parts store stuff, or maybe even some othe online retailers, the products do what they say, have an excellent 110% guarantee and the best customer service in the business. And made right here in the USA.