I just took these poles to Sentinel Dome in Yosemite. The trekking poles are great. I had a 40lb pack on me and weigh 210 lbs. The poles were fine. The quick releases allow the poles to be quickly tightened, retracted, and adjusted all without any tools on the trail. These are functionally the same quick releases you will find on any of the name brand trekking poles (Leki, Black Diamond, REI, etc). Also, the hardened steel tips and baskets are good for use on softer ground for better stability.
I noticed the complaints about the poles retracting. This is due to users not understanding how to operate a quick release. It's not rocket science, just reading the instructions. You tighten these the same way you would tighten the quick release on a pair of Leki poles or the front of a bicycle wheel. Open the quick release and tighten the thumb screw until the quick release has slight resistance but not so much that you cannot move the lever. Then, snap the lever shut. The last bit of resistance comes from the pulling of the lever, *not* from the turning of the screw.
These are strong as you would expect from 6 or 7-series aluminum and no different from the aluminum used in Leki, Black Diamond, and the like. There is no point here in discussing the trade-offs in terms of weight, strength, and materials (aluminum vs carbon fiber, etc. etc) as that is common to all trekking poles.
I would highly recommend these.