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Not familiar with "20 ft up" system, but the HSS has always recommended using the rope that runs from top of stand (or higher) to ground, and sliding the prussik knot up as you go. With that system you cannot fall to the ground. That was how I had my safety system setup for my tree trimming. I looked at the 20ft up web site, and my biggest concern with that system, is from what i have read, it isn't safe to have just the legs and waist in the harness. To me, this isn't much better than a safety belt. The reason being, is if you fall, there are two main problems that could kill you. One, with no shoulder system, you COULD tip over and get trapped upside down. Remember now all those that fall are conscience when they do so. An impact on a tree limb or the stand, ya never know. IF one becomes inverted, for any length of time, it becomes very difficult for the heart to pump the blood as it should and could cause death. In addition, problem number two, is even if upright, and the straps tighten on your legs or waist, the heart cannot get blood past that constriction, and you will soon black out and die. I see they recommend a shoulder harness for "certain body types", but I would not stake my life on whether or not I had it adjusted just perfectly. That design is too close to the old ones that were deemed unsafe many years back. My suggestions is get a body harness and don't look back.
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