Im working my way to one. The small stuff im doing right now, mostly would not benefit or even be held well by vacuum table, even with the un-used table covered in plastic. The unit they sell appears to be sized correctly according to information and math found on the zone, they just have limits. Also altitude effects performance along with porosity of material. Cutters moving 130 ipm all day long will move stuff if its not held down
. The other thing I consider is power. Hard to run and pay for a vac pump for hours and hours while your tiny tapered ball end mill carves out a masterpiece in your desired material.
Anyway I have stuff on the drawing board that will almost require a vac table to hold. So it will be good tool addition later this year.