Got it Neuro. For some reasons, I like flip more than twist.
Have you ever encounter flip locks gone bad? I have a much cheaper Oben tripod with flip, so far, it works excellent. [/quote]
I am in the twist lock camp, but it doesn't really matter that much! On a large tripod, like yours, the flip locks will have plenty of area to grip so they should be fine. As to them going bad? Well yes they will but it is not an issue - as Neuro says - keep that box spanner that came with the tripod handy. They will slacken after a while but an 1/8th of a turn (often less) will sort that out. If you are using it in sandy/dusty environments then just strip it down every so often, give it a good clean and all should be fine. I know a man who has used the Aluminium predecessor of this tripod for more years than he cares to admit - he is quite happy with it, a bit heavy but it does the job at a sensible cost.