Product review (5 stars): Works great to attach EZ mount to EXISTING 3-bolt mount
I completely agree with the review by Ronald Linch.  I replaced my old Insinkerator Badger disposal (piece of junk, sprang a leak after only 3 1/2 years) with a new Waste King L-8000.  This adapter let me easily attach the new disposal, which uses the EZ mount, to the Badger's 3 bolt mount, which was already attached to the sink.

I think the negative reviews come from people not understanding when this adapter is needed and when it is not.  I will try to make that clear:

If your new disposal uses a 3 bolt mount, you can't use this adapter.

If your new disposal uses EZ mount and you plan to remove the old 3 bolt mount, or you are attaching to a sink without an old disposal, you don't need this adapter since the new disposal should come with a complete set of EZ mount hardware.

If your new disposal uses EZ mount and you already have a 3 bolt mount installed in your sink drain (from an old disposal), this adapter will save you the work of removing it and installing the new EZ mount hardware.

If your new disposal uses EZ mount and you already have an EZ mount installed, you don't need this adapter.