I bought this 11 cup Pro Custom to upgrade my currant 9 cup model.  The 11 cup is much heavier, secondary to a more powerful motor, has *really* nonskid feet (you have to pick it up to move it), and is very quiet.  It is easier to get the cover on and off and the large feed tube is on the far side of the cover, rather than right in front of you. This makes it easier for you to see how everything is progressing.  I love it!