My only issue so far was with the installation. The snap ring can be a bit tricky getting into place as you are holding the other parts up (gasket, backup flange and mounting ring). Insinkerator suggested over the phone to put a rubber band around the main flange to hold up the other parts while you install the snap ring. I was using the disposal as a weight per the instructions, but there is still a gap. So I put a sponge between the flange and disposal to fill the gap. Worked for me.

Other than that, works just fine and is much quieter than my old disposal.