Mel - all good comments. I would also add that the stabilising surfaces don't kick in until around 45 knots on the average helicopter (very much higher on the Dauphin) so if you want a measure of controllability you have to speed up, which obviously is not part of the thinking process.
As a result, my own rule is that if I don't like what I see at 60 knots, I'm outta there.
Phil