This is my second garbage disposal of this model. I replaced the first with the same because no plumbing adjustments were necessary. However, the new one had a stripped ground screw and when knocking out the dishwasher plug, the top of the disposal came out of adjustment and could not mount. I finally figured out what happened and forced it back in place. The turntable spinner broke on the first one, but the 4 year extended warranty was no good, because you would have to pay for a technician to replace part that they will not deliver. The part must have been cracked for a long time because one side where it broke is dark gray and the other side a bright steel color. First one lasted 4 years. However, it works good. No reset button or hex screw underneath to unlock.
It is amazing how quiet this disposal is. You can barely hear that's its running. Just a slight hum sound. Installation was fairly easy. The instructions were very well written and displayed with pictures how to assemble and mount the disposal