A Mi 8 MTV - in the unlikely event of a dual engine failure - is great in training (High inertia blades) have not tried the real thing yet. Collective fully lowered (control RPM of course) you can autorotate at 120 km/hr, flare to level flight at very low forward speed and would impact the ground at less than 300'/min descent without raising collective.
Of course it helps to raise collective....!!! But you would walk away from the above scenario.