I recently replaced a 21 yr old Vitamix Super 5000 with the A3500 Stainless finish and purchased this container with it.  I only used the container that came with the machine once and this one ever since.  Simply love it.  Some reviewers dislike the fact you cannot see thru while blending.  I just look in the top and trust the settings on the machine to blend thoroughly and correctly-and it does!!!