A key point to note, I think, when comparing experience of real engine-off landings is the design of modern rotor systems. I was at a briefing by a couple of test pilots earlier this year, who were describing some of the flight testing they do in order to produce the rotorcraft flight manuals etc. All engine failure scenarios apparently assume a pilot reaction time of 1 sec. If you don't react within 1 sec, then all bets are off! With modern rotor systems, some of them can decay in Nr extremely rapidly (compared perhaps to B206 and similar). That is one reason why you will only ever practise double engine failures in a simulator. In the simulator, I often see Nr decaying below 80% with a non pre-briefed double engine failure, on an aircraft which has a minimum power-off Nr of 90%. The test pilots tell me that if the Nr goes below 80%, you are probably toast, as it will be irrecoverable!