I only use one trekking pole. My wife and I share a set basically. I find they get in the way when beating the brush even uphill with a heavy pack they are more trouble than they are worth in the brush. But once I break out of the brushline I unstrap them from my pack and we each use one while uphill. On flat or moderate hiking I don't use one as I only use it for the 3 points of contact on the hills. I don't see much value in 2 myself as I just switch the pole to the hand that needs that point of contact the most. I tried two before, but on the hills and climbing in the rocks I still like having that other hand free so I can him pull myself up by grabbing onto the rocks.
