When I was growing up, these seemed to be ubiquitous and I never liked them. They seemed overcomplicated for the purpose, and created a gross and smelly area under the sink that needed more cleaning.
I haven’t had one in years, as a simple sink mesh does the same job. But I don’t really know how other people are. Are under sink garbage disposals still common, and commonly actually used by people here?
I had one in most of the apartments I lived in, but I was always having problems with them and needing to contact the landlord to fix it (some of this was my fault but still). Now that I have my own place I’m not going to install one, I don’t want to spend money if the result is mostly to get to maintain yet another thing, just to avoid shaking a drain trap over the trash every once in a while.