I have been using my Berlebach Report 3042 almost exclusively since receiving it. This was not my intention, it is just so good to use and as Henning mentions, as vibration free as possible. I use it with everything from 35mm right through to an 8x10" field camera.
My own cameras range from 35mm through to 4x5" with a Toyo 45G monorail and a Shen Hao 4x5" folding camera. I intentionally use it with the inbuilt ball head, which is positioned in the strongest part of the tripod's head. I have the standard 100mm riser as well as the 500mm riser. In general, I only use the 100mm riser for the 4x5" cameras, keeping the 500mm riser for anything smaller than them.
I know for a fact that the tripod holds an RB67 with 250mm (?) lens rock steady. Not my camera, but we used it for a studio situation with a dolly. I would certainly suggest using a dolly if you are on a smooth floor; like many tripods, stopping the legs from moving around and/or splaying a bit, is completely stopped when a dolly is used. We built a cheap dolly using found pine (softwood) timber and a set of locking wheels from Aldi, perfect.
The built in bubble is accurate, and with my right hand holding/moving the camera, I can easily lock the ball joint with my left hand easily. I have never contemplated using anything like a triple head unit, they just waste time and are in my opinion not needed with this tripod. If though, you require extreme angles, then they could be useful. But for most situations they are another addition of gear that slows you down, especially with portraiture.
My tripod only has a single extension, which to my mind should be more stable than a double extension model. That though is conjecture as I've never used a Berlebach double extension tripod. Regardless, that was my reasoning for purchasing this model Berlebach tripod.
I have around 12 tripods, three of which can easily hold my 4x5" cameras, the Berlebach is the one I use all of the time now.
Attached are some images, the Shen Hao 4x5" wooden folder is running a 250mm telephoto lens, this shows the whole of the tripod. The Toyo 45G is running a 400mm telephoto lens, this is the heaviest combination I use on this tripod and pretty much getting to the limitations of this tripod if you wish for absolute integrity. The 8x10" wooden folder mentioned earlier, is lighter than this combination.
The weak point of my tripod is when using the rubber feet on smooth surfaces, to counter the spreading and sliding of the legs, I use a thin chain between all of the legs. Using a dolly, is the other better alternative on these kinds of surfaces. With the rubber feet removed when used out in the field, the spiked feet work very well; the tripod does have a small collar for your foot to press the spike into the dirt.
Mick.