Product review (5 stars): This is the answer to that old deteriorating rubber in your sink!
I had no idea this even existed.  The rubber on my old disposal looked horrible.  I thought I would have to wait to replace the whole disposal before I could change the top rubber part.  This was so easy!  I just cut away the rubber flaps on the old one, and popped this one right in over it.  It looks great!  It is true that you do have to push food into the disposal, whereas before it usually just got "sucked" in.  But it looks so much better!  Very small inconvenience if you ask me!