I've gotten skinned up & clothes torn by riding the original Baker stand down a frozen oak.
Knock on wood, I've never had a harmful fall from a climber, but did have the top piece of a Summit climber break while I was sitting on it one morning. Scary, but didn't fall (thanks to safety harness).
Years ago, I saw research that suggested 1/3 of all stand hunters will have a fall that causes permanent injury.
I presume "stands" would include ladder, hang-on stands, climbers, tripods, and also
ANY elevated stand, such as a permanent tower. Falling from a nice box stand doorway can be as serious as falling from any other ladder.
My worst falls have been from hang-ons & ladder stands.
And I believe the risk is greater while installing or moving than in actual hunting.
I've certainly leaned "the hard way" now to always wear a safety harness.
Steel can just suddenly break under a hunter's weight.
My serious falls have been from steps breaking and my foot slipping off a step, and in once case, missing the step by having my foot outside a narrow ladder.
Narrow ladder stands can be surprisingly dangerous.
My only "permanent" injuries are debatable, as they have been broken ribs, broken toes, and a broken foot. My highest single fall knocked me unconscious, but my only physical injuries were broken ribs & abrasions. Just dumb luck I haven't killed myself by a fall. Everything has healed, but old injuries can add to lifetime aches & pains.
Luck is not a good plan.
Be careful & wear a safety harness.