I've installed them a few times, and replaced one. Pretty easy to do (just make sure you grab any fittings/flanges/adapters you might need. Installing in the new house was actually a pita because the fittings were some oddball size that I couldn't get in Canada apparently. So I've got more flexible reducers than I'd like, but it worked.
I'd recommend going a minimum of 3/4 hp. And +1 for insinkerator. Totem quite often has them on sale.
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