I've owned four HOT-1 Insinkerators over the past 15 years or so and they always failed prematurely--mostly the little "plastic" handles would break off or become permanently frozen in "on" position. These are such useful conveniences, so this time I decided I was going to "invest" some extra money in a top rated one and I have not been disappointed. That On lever has a solid feel and the design of the Involve HC-Wave is superior in every way. I installed it myself under the kitchen sink per install instructions without a hitch--and I am not young.