The point of this product is to give you the choice of having the start stop feature when you want it instead of being forced to use it and manually override it. Research has shown the start stop feature can increase your mileage up to 3 to 5% depending on your driving habits. What I have not seen is how much extra wear it adds on the engine, electrical and transmission. When you think about the engine having to build oil pressure from 0 psi every time it starts along with the electrical draw and the transmission having to pump from 0 how does that effect overall longevity of these components?
Personally I would like to have the option for it to stay on or off which is what this product provides.