I had used Thunderheads for 15 years and shot many deer with them. Last year I shot an 8 point at 12 yards and had a perfect shot. The entry wound was high on the chest and the exit hole low. The exit hole got plugged, so the blood trail was lost after 60 yards. The deer somehow went over 300 yards and I only found it by dumb luck after 4 hours.
This year, I swithed to a Rage 3 blade. I shot another 8 point. This one was at 30 yards from a ground blind. The shot was just a fuzz high, but still through the lungs. He only went 50 yards.
I agree that the blades sometimes fall out of place, but if you just check them when you get set in your stand, you'll be good. I love them.