I use a 9' Cambo UST. Virtually all of my work is with the camera 'locked down'...iow, once it's in position it doesn't move until the shot is done. The studio stand makes getting it into position relatively easy from 1" off the floor to 9'+ off the floor with the twist of a single lock and raising or lowering the counter balanced arm. Incredibly stable...and my camera is heavy. In addition to the Cambo, I also have an old Arkay that I've since converted to hold a 1'X3' rigid fiberglass bank light. The Arkay isn't nearly as well constructed as the Cambo, but it does work as intended. I looked at the Manfrotto Salon stands years ago and was interested because of price, but in the end concluded that it wouldn't be sufficiently sturdy for my needs as they're fairly lightly constructed compared to the others mentioned. But, YMMV.
You might be surprised if you look around (and get lucky)...I've seen Foba and Cambo stands on CL going for less than the cost of a mid-level tripod. I also used to work with an old Arca-Swiss stand that was a thing of beauty...not nearly as versatile as the Foba/Cambo designs but for what it did, it did very well.
As studio photographers close up shops, imo, there's not a very large market for these things and the used prices reflect that. I had a friend that recently retired. He tried to give away his old Saltzman camera stand with no takers. It ended up going for scrap.

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