411A,
Not sure where you are coming from here. As an ex-engineer with a major airline I believe that RR engines are the best one can purchase for any a/c. Apologies for being a tad light, but their bird ingestion testing is the best for example. OK there may have been pylon issues wrt 767's but who else throws frozen chickens into engines as part of their testing ?
Just my two-pennyth worth