What do you guys think about the Black Diamond Carbon Ultra Distance Z-Poles? Do you think they'll be durable enough for a thru-hike? I am still tying to decide what is best for my trip this year. I was also looking at the Black Diamond Trail Ergo Cork as an aluminum alternative (albeit nearly twice the weight). Also, what is your opinion on non-adjustable trekking poles? Carbon vs. aluminum, adjustable vs. non-adjustable? I'd love to hear your comments. Thanks guys.