As someone who has witnessed an A330 stall in the simulator I can assure you it is a 'pig' of an aircraft to recover if you get it fully developed. Also don't forget that you will only have the benefit of the BUSS if you have the presence of mind to switch off all the ADR's below FL250 in the middle of a very confusing situation and then it is as useless as a chocolate teapot if the aircraft is still in a stall. Sounds similar to the AIRNZ airbus in France, the aircraft should have been totally recoverable if the initial situation had been handled properly.