Our previous disposal unit came with our house when we bought it and due to its age and the loudness at which it operated, we thought it was time for a replacement. Because we had a unit that was operated at the drain, I looked for a similar replacement so I wouldn't have to go through the problem of installing a switch for it. I read reviews on the Evolution Cover Control Plus and felt it worth the investment. It exceeded my expectations. As a DIYer, installing it was easy. The first time I tested it after turning the power back on, it was music to my ears: I could hardly hear it operate! I definitely recommend this to anyone seeking a new disposal unit. In fact, I'd give it ten starts if I could!