ROADTRIP:
Have operated the RB.211 for twenty years, altho not the -535 model used on the 757. My experience is on the -22B and -524B402 models. Anyway, have found it to be VERY reliable, have only had one shutdown, due to high vibration (fan locator bearing). Yes, it is heavier but quieter and more fuel efficient. Be prepared for slower starts (and strange sounds) as the three shaft design takes longer to wind up. I became a convert a long time ago, the RB.211 is one FINE engine.