As you all know, Bringing the cyclic back (Flaring) INCREASES Rotor RPM, thus you control the RRPM with the collective while bleeding of the airspeed/climbing (or whatever). In our smaller helicopters, the RRPM rises fairly rapidly (low inertia) while in other machines, it does not increase as rapidly, but then again it does not decrease as rapidly either.
Dont know if anybody has any more input?