Panthera X wheelchair in Norway is for people who are stronger or have good enough skills. Because they don’t have security in the back. So, Dezziv brakes work very fine,  also in the city, on the stairs and slopes or ramps. Dezziv brakes work very well also for weaker people, to help them climb slopes easier. I bought these brakes because I wanted to try them and I’m a happy user of them now.  : )