Product review (4 stars): Excellent design.....
Forget the negative reviews.  This product is innovative.  Water is designed to pool around the rubber flange to baffle the noise of the already quiet disposal.  I would not use this if the disposal you have.e isn't specifically designed for it.  You cannot shove it in the drain and expect it to work as designed.  It slides into a manufactured slot around the edge of the disposal.  Not all disposals have this slot.  If the sink is filling up with water then your disposal isn't designed to use this.