I have done the APBA dunker test. It was in a very tight F1 outboard style dunker. Five point and steering wheel come off, then you slip out upside down in water. As for a cat at 150mph I would much rather be in a canopy boat with belts then an open cockpit at that speed. You will have no chance in an open boat. Same reason race boats switched to full canopy. I will take the slight risk of drowning versus being torn to shreds getting tossed out a boat.