In reply to Mark Stevenson:
> (In reply to Sharket) Another vote for the BD flip-lock adjustment.
Just to confuse matters I've sometimes found flick locks to be more problematic in icy conditions than old style barrel locking systems. I've had the flick lock mech freezes inside a lump of ice and could only gets the ice off by sort of putting my mouth round the pole! Also although I've got pretty strong fingers, I have found at times in the cold I haven't been able to flick the flick-lock - I think the plastic contracts. Barrel locks sometimes don't want to tighten back up, but I've never had problems undoing them. So, I wouldn't say don't get them, but I've had no less problems with them than with various Leki and similar poles with barrel lock mechs.
Sharket, the lighter ones tend unsurprisingly not to be as strong. I've now snapped the plastic end spikes (they are replaceable and designed to snap, rather than the bending the alloy pole so its not the end of the world, but both times happened during trips away) on my lightweight Dynastar poles. I've never done that with various Leki poles I've had over the year that have been used much more.
Leki is well worth a look, they have been doing this longer than many - I got my first Leki trekking poles in the early 90s and got a good decade of use from them. I still use a pair of Leki 2 piece poles for ski touring now that I bought in 1994 - and I'm a crappy skier who has snapped poles in the past!
Thinking about it I've used loads of different makes of poles down the years and don't think there is too much difference in use, just in longevity and toughness. I wouldn't bother with the spring loaded ones.