Always remember that 'extensible centre columns' = 'built-in variable wobble'.
If you often find that you 'need' to extend it, you probably bougth the wrong tripod. That's the biggest issue with my old Slik 500g. It's too short, so I end up crouching to avoid using the wobble column.
(500g; named after weight... Very nice to bring when on long hikes, but limited in which cameras I can use)