Just managed to test the Catbells on a 30k trail race. In the beginning, I had a little trouble locking the poles in place until I realised I need to use a bit more power than expected to pull out the section until the locking button appears. The set-up guide explains it well, the problem was on my end. Finding correct height is super easy - just find your body height and adjust the pole accordingly. No need to count pole centimeters. An incredibly smart detail - great job Harrier! Never seen that before. Poles are easy to unfold again, feel lightweight and compact for my needs.