My house had an Insinkerator batch feed disposal in it when I moved in 38 years ago. This is the second replacement since then. The first replacement, a Model 17, appeared identical to the original unit. This time around, the Evolution Cover Control Plus had been re-engineered and improved. The cover/switch mechanism was redesigned, sound insulation added, and the outlet pipe is now vibration-dampened. 

The net result is that the disposal is an order of magnitude quieter than the old model and feels very solid. It's like the difference between a lawn mower engine and an automobile engine.

The one problem for me was installation. Because of the sound insulation, the maximum physical diameter of the new disposal was larger than the old model. The old model barely cleared the sink cabinet side wall. The new unit initially did not fit. We had to cut away a part of the cabinet wall. After that, the disposal fit in.