Schwert, I've used the monopod you linked to. While I found it most useful as a monopod for shooting, I don't like it for a walking staff in any critical conditions. My experience is that it will release and shorten if under significant pressure, or... you've twisted the fittings so tight that you might have trouble collapsing the stick for storage. And it is too frail for lateral support when fully extended.
Just my opinion.