Hey Al, I use a shop vac connected to a Dust Deputy, but it is only hooked up to my random orbital sander.
I use a full size 1 HP dust collector connected to a separator for everything else, including my scroll saw.
The vac/ Dust Deputy does a great job for sanding, but I don't use it for anything else.
The HP ratings on shop vacs are phony. It's impossible to get 5 HP on 110 volt circut. I 1/2 is about all you can get. The real ratings are amps.