These poles are the best in this price range IMO, but they do fail fairly easily. My sons and I all had sets of these for the JMT last year (they are the ones being used in my avatar). All 4 of my son's poles failed before Mammoth (one of them mid-shaft) and had to be replaced or repaired. I managed to use parts from those poles to form one usable set, and picked my younger son up a set of ski poles from the Mammoth thrift store. I initially attributed the broken poles to my sons being harder on their poles than I am (which they are). One of my poles ended up failing on the second half of the trail at one of the adjustment points. I used gorilla tape to keep it at a fixed length for the remainder of the trail.
I currently have one new set, and still have the set that I used on the JMT as well. I cannibalized the kids broken ones to restore my initial set, which I have been using regularly for a year since then with no problems. The difference is that I have not adjusted the length in over a year, as the adjustment points are what seems to fail most often. I've had many incidents of them jamming between rocks, hanging up, etc and mine have not broken except at the adjustment point. The other issue is that the carbide tips are not easily replaceable. I replaced mine by cutting off the old tip (being careful not to damage the carbon fiber pole) and replacing them with ones that can be easily changed by screwing off the threaded carbide tip.
These are better than typical discount trekking poles IMO and I haven't seen anything in this price range that is better, but quality wise they don't quite match up to the higher end poles. I think they have good potential if they make the length adjustment mechanisms a little more reliable. If you use them for a thru-hike, I would recommend keeping them at a fixed length.