I finally broke down and bought the vac sys this week.
Congratulations - you are one of the very few members of FOG to have one! It's one of the things on my Wish List, and I am sure that many of us will be looking forward to hearing about your experiences with it. I'm envious!
My second question is, can I fix it to the MFT table using the holes in the table? There are holes in the base, but I can't tell if they are threaded or not. I have searched elsewhere but haven't found any answers.
There are four recommended methods of securing it to a surface, as far as I know:
1. Place it on a smooth and non-porus surface (
not an MFT!) and it will clamp itself to the table by suction if you move the green sliding valve on the left-hand side of the base towards you (in the illustration below, move valve 6-1 to position B to clamp onto the table, and to A to release).

2. Fix it to an "Adapter VAC SYS AD MFT/3, Order number: 494977", and fix the adapter to an MFT/3.

The unit will swing down under the MFT out of the away when you don't need it. The unit is secured to the adapter by four M5 x 40mm long machine screws. The screws fit through four holes in the corners of the adapter plate, then through the four holes in the "feet" of the vacuum clamping unit (5-1 in the first diagram above), and are secured by four nuts and washers. It would therefore appear that the four holes in the base of the vacuum claming unit are not threaded.
3. Clamp the unit to the MFT using standard clamps like the FSZ100. Probably best to use the clamps inverted, so that the handles are underneath the MFT and the feet of the clamps are placed on the ridged portion of the corners of the unit.
4. Screw or bolt it onto any suitable worksurface using the holes at each corner.
So, in answer to your question, yes, you can use the holes in the MFT to secure the unit - you insert clamps through the MFT holes and clamp down the corners.
Forrest