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?
Easy to replace? sure. A couple hours if your handy.
But installing one for the first time will require electrical in addition to the and plumbing work. It’s a pretty big job for a DIYer.