Jerold, is the one knob model a single leg extension one? I have a Berlebach, model number not printed on the legs and I can't recall which one it is right now, that has two knobs, three leg extensions and is a lot of knob adjusting to setup. I also have a Slik 330DX with three leg extensions per leg but the flip locks make it a snap to setup. I bought the Berlebach model because it was a small package when folded but in retrospect I would have gotten the two leg extension model. I also have a Gitzo Studex with a No. 4 head. The only thing I can say about it is it will hold just about anything I would want to put on it, like dozen ULF's at once. It's just too heavy to take out unless it's next to the car. It's a studio model and is h e a v y.
The perfect tripod would be a Berlebach with quick acting flip locks like the Slik. I am saving for an Acratech ball head, it does look like the best one, and I am considering a larger Slik tripod to use it on.