The "rigid rotor" MBB Bo105 has a pronounced vibration as you transition "back" through ETL. The speed range is quite wide, and the vibration goes away once you're fully in a hover. Sometimes, if you can't get directly into the wind for some reason, you sit there, anxiously wondering if the vibration is the "normal" 105 roughness or the onset of VRS. Fun times!
Many 105 pilots will ride the approach down, smack-dab in the middle of the vibration range, making for a teeth-rattling, rivet-loosening, gyro-killing approach. Savvy 105 pilots will decelerate to just above the onset of the vibration and hold it there. As you come to your termination point, a tiny bit of aft cyclic is all you need to drop the rotor completely back through ETL with (hopefully) no appreciable power change. (I say "hopefully" because those dang ol' C20B's ran so hot in the summer time and you don't want to be yanking in a bunch of collective at the bottom.) Using this technique, the duration of the teeth-rattling/rivet-loosening is truncated. The key is very precise attitude control on the way down. The only other multi-blade rotor system I've flown is on the Sikorsky H19, which has less vibration coming back through ETL than the 105, but the technique works equally well. To a pilot trained in single-engine piston helicopters, who was taught to stay well out of the shaded-area on approach, this technique seems painfully, dangerously slow. But it is nice and calm and predictable, and requires no big pitch attitude or power-change at the bottom. Added bonus: no yaw change either.