I find vacuum hold down is good for some things. Try cutting a sheet of formica without using a vacuum! How about a sheet of veneer or 1/8" acrylic. Vacuum makes these cuts simple and error free. I rarely use vacuum for anything that is stiff though. I'd rather use a combination of scrap boards and T-track clamps. I've never put a screw into my spoilboard. I can always find a better way.
ShopBot Details:
2013 PRS 96x60x12 (Centroid upgrade)
4hp Spindle
12" indexer
Aspire
Rhino
Fusion 360
Ferrari 360
Prusa MK3S+
Prusa XL multi-tool