My feeling is the trent 1000 would have to be considered in a different light to the t500's we have hanging off the -600's, why? for a start there wont be four of them per a/c and my understanding is they will be bleedless so based on those two factors I think we can discount experience from the trent 500s, although to reinforce what NWT said they have technically performed well,personally very rarely had the cowls open on the line for anything severe.Touchwood...