1) don't ski on 3 section poles
2) when using collapsed poles like two ice axes, don't kick your front points through the poles
as ChrisB says, proper maintenance goes a long way. However, I'm not very good about cleaning the poles after each trip so I find a couple of times a season I have to take light steel wool to the bottom sections to keep them sliding inside the upper sections. Otherwise, that crud dries up and makes them stick. More than a few times, I've been at a trailhead and couldn't get the damn things apart. Luckily, I carry some vise grips in my truck toolbox.
I prefer the cams on the BD to the twist-locks on others....
Also, a little lok-tite helps the screws on the cams. I've lost two of the screws that hold the cams together. Now I've "lok-tightened" them and they stay.
The cork grips on high-end Lekis are much nicer, but you can't have it all. Between my girlfriend and I, we have 4 sets of poles and we mix and match the wrist straps, grips, and baskets, depending on activity.
spencer