Trekking poles are part of my hiking shelter scheme and I use at least one for hiking now. They are great for rock-hopping creeks and they make those root-and-rock-bound sections of trail a lot easier to navigate-- going up or down. You know that feeling that you are going to fall on your face going down rough sections of trail? Trekking poles turn it into a ballet. You plant a pole, brace with the other pole as needed, step down and repeat. With a little practice (one good hike), they become an extension of you body and you don't think much about it.
Here's a nice bit of trail to Lake Snoqualmie in the Washington Alpine Lakes Wilderness last May. You are looking down the trail with snowmelt running right down the middle. Trekking poles made this much easier to manag
I use Black Diamond poles and I like the locking mechanisms much better. The lower lock on the Black Diamond poles is a spring-loaded pin that snaps into preset holes. The upper lock is a screw tensioned cam/lever, all on the outside and it can be adjusted with your SAK or even a thumbnail, as you adjust it with the lock slacked off.
The Komperdell locks are flaky, IMHO. I have a single
Komperdell/REI staff and it is too easy to overtighten the lock and have it slip. With plastic-on-plastic threads, it is easily damaged. I think the shock features are just extra weight and hype--- I want a good solid feel when I plant the pole, not some spongy travel to compensate for.
Bicycle gloves (with as little padding as possible) are great to use with hiking poles too.