My first year bowhunting I purchased a climbing tree stand, not mentioning the brand, let's just say it was an "Aging Male". Any how, I used it a few times and was happy with it. One morning I climbed to my desired height and had to move the netted seat to the sitting position, you do this by climbing over it; when I did the shift in weight caused the platform to lose it's purchase and down I went.
I had a strap on and it slid up under my armpits. Once I dropped I wasn't able to bring down my hands or arms, I was dangling in a hands up position unable to do a thing. I was hunting alone, and no one would look for me till after sundown. After my initial screams of help I collected my thoughts. Luckily I had my bow's tote rope tied to my wrist; I slowly brought the bow up, took an arrow and used the broadhead to cut the strap fully aware that I may break something in the fall. If I didn't I would lose circulation in my arms for hours, so I felt the fall and possible breaks was a lesser of 2 evils.
After cutting the line what I remember is just being instantaneously sprawled out on the ground and having hit my right elbow pushing it into my shoulder. Luckily I didn't impale myself with my broadhead. I got up and started moving all my limbs to make sure I was okay. I drew my bow to make sure my right arm and shoulder weren't damaged, everything was alright. I sat on a stump, collected my thoughts and mentally "licked my wounds" for about a half hour. I then found another tree to climb; just to get back on that horse and hunted the rest of the morning.
That night when I changed I had bruises around my armpits about 7 inches in diameter. I was lucky I didn't snap my back, neck , break limbs or impale myself. BTW I weigh 230 pounds. The irony is that I was thinking about getting a harness system before this happened but thought it was too expensive - WRONG! I never go up without a harness, not a strap but a harness. I owned the Guardian system, and now have the Hunter Safety vest.
(I later returned the stand to Cabelas, they were great, even though it was used they let me exchange it. I now own an API and a Summit and love both of them; they really bite the tree, nice and stable.)