Product review (5 stars): BUY IT... if replacing old 3-bolt mount disposal with new EZ mount disposal.
I recently bought a Waste King L-8000 disposal (featuring the EZ mount system) to replace a Badger 1 disposal (featuring the 3-bolt mount system).  Whichever system your sink currently utilizes is probably the system you want to keep rolling with, trust me!

The #3101 kit is very simple... it literally contains just the two pieces you see in the photograph.  All you do is swap out two pieces that came with your EZ mount disposal with these two pieces.  You will then be able to connect your new EZ mount disposal to a sink that contains 3-bolt mount hardware.  On a scale of 1-10, I would say that the difficulty factor is a 1 or 2.  Have I mentioned it was easy?

Additionally, Anaheim Mfg Co is (the company that makes this kit) is the same company that manufactures Waste King disposals.  So, everything fit perfectly and effortlessly.