Some helicopters are prone to dynamic rollover, some helicopters have low inertia rotors that are unforgiving to slow reaction to engine failure, some helicopters are prone to mast-bumping, some helicopters find it easy to chop off the tail, some helicopters are very vulnerable in turbulence and some helicopters have extra speed limitations placed on them by manufacturers safety notices.
But I wonder which make manages to encompass all these flaws..............