Alex, I recently replaced the Bogen 3021/Manfrotto 055 -- not the same design as current 3021s -- I bought in the '80s with a Berlebach 8023. The Bogen was fine with shorter lenses, but lacked torsional rigidity and this was a problem with long lenses. If I so much as breathed on it the point of aim moved.
Before I bought the Berlebach, I spent part of a Sunday afternoon in B&H trying out all of the tripods they had on display. Only one, an enormous carbon fiber Gitzo priced over $800, had the torsional rigidity I needed. The problem seems to be that multi-section legs flex a little at the joints between the legs, even when the leg locks are as tight as can be. I used to think this was a design problem, but after seeing a pair of quite new 3021s, one very stiff, the other quite limp, I've come to believe that it is may be an adjustment problem. Tightening my aged 3021's leg clamps as much as possible didn't solve its problem.
Along the way to the Berlebach, I looked at surveyor's tripods, even bought a big K&E wooden tripod for $10 at a yard sale and put a head on it. Big problem with them is controlling leg splay. The large Zone VI tripod is a converted surveyor's tripod, uses a nylon cord running through eye bolts to hold the legs together. It is wonderfully rigid, but gigantic and heavy. Anyway, my K&E monster has wooden legs, and it takes quite a while to stop "ringing" after being whacked lightly. So I take claims that wood damps vibrations better than, say, aluminum tubing with a little skepticism.
But to get to the point, the 8023 I bought after having an opportunity to play with it is much stiffer in torsion than my old 3021. And it supports my tandem camera -- two 2x3 Graphics, one in front of the other, with a coupler between them -- with 480/9 Apo Nikkor very well and the point of aim doesn't shift when I touch the tripod. I've used the 8023 once with my Questar 700. I was on a wooden structure that wouldn't sit still -- long story -- while shooting, so don't want to draw conclusions from those results.
I believe that Berlebach's design makes leg joints that give less. The mating surfaces are longer than in "tube in tube" designs.
Cheers,
Dan