Before the implementation of the 'Reduced Charge" MB seats, MB had earned the reputation as the MB back breaker. I did closely observe my wingman's ejection from his inverted and spinning TF-9J Cougar which had that particular result. But alas, my landings equaled my takeoffs, so no tie for me.
I have a few thousand hours of sitting in MB seats and several hundred in Escapacs and they were both great seats for their time.
Around a ship, there are multiple ways to have bad experiences. After observing the results of someone else having an extremely bad day, I made sure that the guard over the alternate handle was down because split seconds really count and that was the quickest way out. I would have had no hesitation in using the seat if warranted.