Hands up who has flown an Astazou powered aircraft? Of those that have, was it a good, or a bad engine?
Like most powerful, lightweight turbines of the era, they were a very popular single engine helicopter engine, proving most reliable in service, and very durable.
There were no Astazou powered Jetstreams in Australia. The RN flew them in the UK quite happily for about 40 years, and the only loss was an overwater airshow crash in Portland Harbour around 8 May 1989. The crash was nothing to do with the engines.