I have an Insinkerator that came with the house I bought. When I bought it, I was so excited to have a disposer. But, truth is, I don’t use it very much. It’s good with potato peels, but I seldom eat potatoes anymore. Apparently onions are too fibrous and stringy to put in a disposer, so I don’t put them in. Carrot peels seem to work OK, though.
As a side note, the best disposer scene I have seen is in Ordinary People, when Mary Tyler Moore shoves the French toast left uneaten by her troubled son into the disposer. “You can’t save French toast!” she says.
So, if I ever find myself in the kitchen with an uneaten stack of French toast, well, there you go!