I returned these sticks because the twist lock system is very bad. I did not have a failure, but instead it was very difficult to actually get the mechanism to lock into place. I would have to hyper-extend the pole, push it back a little, then see if I could twist it locked, then I would slowly try to loosen it just a bit, then slide it into the level I wanted. This trick would work sometimes, but mostly it was a P.I.T.A. - so, after my first adventure, I decided to return it. I appreciate BC's NQA policy for returns very much, and it was a pleasant and easy process to return the product. Thanks, Backcountry!