Product review (5 stars): Couldn't be better!
I decided to replace my worn out Insinkerator with a Costco special.  I was very dismayed when I found the new unit had EZ-mount instead of the near-universal 3 bolt.  I have a high quality brushed nickel drain in for the 3 bolt, and couldn't find anything comparable in an EZ-mount.  I nearly returned the disposer, but then I found this adapter, and it works like a charm with all the existing 3 bolt stuff.

I like the WasteKing disposer, but not the EZ-mount.  I see Costco is now selling the 9980 model which is inherently 3-bolt without need for this adapter.  I'm thinking they had lots of returns when people discovered the EZ-mount wouldn't work easily with their existing setup.