Agree with the others on the 055, I've use this one for a year now and not found it lacking in any way whatsoever. Strong, sturdy, quick & easl to use. It's just about as heavy as I'm willing to carry when out landscape togging. Don't know about the head but the spec seems plenty man enough.
Another benefit the 055 enjoys is height. At 178.5cm fully extended column and 142cm fully retracted column I find that I can do most of my level ground tripod shooting around the 142 position (I'm 5' 11") therefore plenty of column adjustment available when you have to have the legs at different heights due to uneven ground, seashore rocks, slopes etc
Cheers, Dave B.