Twice. The first time was about 1981 with an old Baker before hand climbers and you had to hug the tree. The bottom part cut out on me at about 12-15 feet and I skidded all the way down landing on my bow which was leaning against the tree busting all my arrows. I took all the skin off my chin, nose, arms and knees. I was hugging for all I was worth but once I started it was just like someone took a wood rasp to me.
The second was a new model of Loggy called the "Master Hunter" that was yanked before it ever really hit the stores. I bought it at the Jamboree in Harrisburg off the floor. I tried it in the yard 3 or 4 times and having an old style Loggy for a few years felt comfortable with it. The extending slide arms were made of a composite. I hiked a mile back in the Adirondacks my first hunt with it, got to about 12 feet and the handclimber arms snapped pitching me backward shoulders first on to the platform which then snapped, leaving me dangling upside down from my safety belt. I got righted, unhooked, climbed down a little sore and sat on the ground right there. 10 minutes later I arrowed a buck at 7 yards. Bad story with a happy ending. I won't even go into the "NON-HELP" I got from the old loggy manufacturer who soon claimed chapter 11.