I posted this in another forum but bears repeating :
Ten years back I took a 19' fall out of a hang on and caught the tree stick peg in the the leg just below my right cheek and in gashed around to the side almost to my pants side seam line and then another peg caught my other knee and almost removed my knee cap. End result was 12 hrs in surgery, almost bled out, and around 400+ stitches to put me together. Not fun and since I hadnt worn a harness before, I purchased 3 to hunt with.
I was back out hunting in 3 weeks after but didnt climb a tree for a year. I feel it every time the weather changes and "I'm lucky to be alive" (surgens quote) and it has changed me forever. Please secure yourself before leaving the ground, someone wants you to come back home after the hunt!