Thank you so much everyone who responded, I have taken note of your observations, I am not promoting this harness, just curious as to the philosophy it is being marketed with.

The idea of supporting the pelvic girdle rather than the lower back does make sense to me, I'm just concerned about my lower back not having any support.

Building up muscles round the lower back makes sense and I believe that the designers of this harness actively stress the importance of correct body conditioning for our type of work.

I am grateful for evryone who took the time to type a response.

I will try and find a video of a treeclimber at work in the tree, maybe it would help you guys if you ever had to deal with a tree surgeon/climber who was having back problems? at least help you understand the stresses and strain our bodies are under.

Thanks again

Grover