I climbed 6 trees last weekend with the kestrel and Petzl Rad system. Petzl Ascension, roll-n-clip carabiner, foot loop and a petzl rig. I was using 7/16 or 11mm Blue water assault line. This thing is way more comfortable hanging than my walkabout aerohunter hybrid harness. I know that is a vague statement, but I knew as soon as I let the bridge out that I made a good decision to order it. I was a little concerned when I was climbing because when I cinched up the bridge to climb, it really put the squeeze on me. I let it out a bit and it was fine. I'm talking about hip pinch here. I ran the bridge about 16" per side with a petzl ring. That is really good for me. The only other thing is it seems like the lineman's belt loops are way back compared to my other harness. It is unbelievably small, compact and comfortable.