Been doing CV for the last 15 or so.

Have always used the M&S AirVac units. Not that they've always been the best, but they have been good to stand behind the product when there was some problem units over the years. And yes, that's important. Your reputation is tied to the manufacturers equipment, regardless of how well you do the install.

I think the CV sales and installation business is better in some ways than the theater, multi-room audio, etc.

Think about it. You install this thing, and most often, never have to come back and tweak, come back and explain how to turn it on, etc, etc, etc.

No money in it? Surely you jest!