I purchased this disposal to replace mine which had become very noisy. The installation was straight forward. Mine came with the button and adapter which would enable one to operate it from the counter, but we have granite counter tops, and I was unwilling to drill a hole into it. It works just as well using the wall switch I already had.
I was hoping it would be quieter than my old one, but I was amazed at how quiet it is. It truly is almost inaudible. 
It works well and both my wife and I are very pleased with it.