I have just posted the test results for the MT055CXPRO3 and MT055CXPRO4 tripods. These are the top of the line still photography tripods from Manfrotto. These tripods are somewhat large and bulky, but perform very well for the price. They represent one of the best value propositions in tripods I have seen yet. Not to mention that they also include a number of innovative features, such as a fast setup horizontal center column. These kinds of features tend to add weight and reduce stiffness, but the MT055 tripods perform well regardless.
As we can see from the snapshot of the sorted rankings below, the MT055CXPRO3 is the best performing tripod I have seen yet on a stiffness or stiffness*height/weight adjusted basis that is under $600.
The four section version performs less well, as expected, and should only be considered if the length of the folded tripod is a high priority.