Well, I have the 055XPROB here... Nice tripod. The center column's ability to pivot is a nice bit of engineering but I think that is going to eliminate it as a choice for me. Basically, that feature causes the center column to always be somewhat extended by a significant amount. I had hoped it wouldn't be an issue, or that piece could be removed and allow the column to be fully lowered. And anytime you extend the center column, you lose rigidity. Recall that I am shooting medium format landscapes and it is all about sharpness for large prints (otherwise there is no point). So vibration control is critical.
I could fabricate a custom insert for the legs but that's a bit of hassle and I wouldn't be able to eval the stiffness until it was done.. And I'd risk marking up the black bits and not being able to return it. I do know it would be *way* more rigid than the stanard column setup.
Minor/major grip: the levers on the leg flip locks are plastic. The flip locks themselves are alloy/aluminum. The downside of any plastic is that it deteriorates over time and is prone to snapping off if caught on something in the field, especially in the cold. Plastic also breaks down in UV. The previous bogen models were metal. I have an old slik U212 tripod... Nice piece but the plastic on the head has cracked, rendering it useless. So I'm very anti-plastic on tripods.
One of the legs has a bit of stick in one section. All the legs except that one drop freely when the clamp is released.. It is has freed up somewhat but it makes me wonder what is going on (debris in the leg, leg not straight, etc) and if it will ultimately come back to haunt. When I'm hiking from spot to spot, quick leg extension is critical. I expect a new tripod with flip locks to be perfect.
The ball head is decent but more like 750 grams than the 499 on the spec page. That's a 50% difference, so pretty significant.