Product review (5 stars): Well worth the price!!!!!
My only regret with this adaptor was that I did not purchase it when I purchased the Waste King disposal so I had to pay extra for shipping.  This adaptor allowed me to change out my old disposal for a new Waste King in 40 minutes!!!!  The only thing that could make this product better would be a backsplash more in style with the disposals.  I used the back splash flaps from my original disposal which look better than the ones that came with the adaptor.
The biggest advantage besides time savings is not breaking the seal of the sink and introducing a new place to leak from!
But I would buy this again in a heart beat!!