Capt Wally,
I saw some BIG stacks in G115 aircraft, which would have ended in fatalities in aluminium planes - only to see the foreign pilot climb out and walk away. Absolutely amazed me, and I thought it nothing more than luck the first time round, until time after time they were stacked during a go-round and the pilot walked away uninjured. A four point aerobatic harness and a "built like the proverbial brick s*** house" composite airframe, I have no doubt, is the most durable and safest when it all turns pear shaped.