Don't forget about the Taig 2010 tooling plate:
It is thicker than most of the other units out there as well.4" x 14" x 5/8" Tooling plate for Mill. Bolts down to either 2018 mill table or 2019 mill table. Plate has 56 10-32 holes that are 1" on center spaced
The A2Z units are nice as you can get one that is pre-drilled for a Sherline rotary table. It comes down to which unit will best suit your needs. I've had folks buy the A2Z unit as it was not as large as the Taig 2010 so it fit his particular needs better for the project he was working on.