Well, the first sign of wear and tear has appeared with my Breville. I have been using it daily for three months. The food pusher is hollow, plastic, and the cap is removable. Under the lid is a metal disc attached with screws that thread into the hollow plastic pusher tube. The threading for the screw broke on one side, so that the metal disc cannot attach. The cap can still attach.
I did notice that the part costs $25 to replace and that it is currently out of stock on the Breville website.