Robbie’s have mast bumping, AS350’s have servo transparency, jetrangers have LTE,
OMG, another believer in the LTE Myth. But that is another matter completely.
Every teetering head is subject to mast bumping, but the R22 seems to have more of it due in part to factors mentioned above.
The 407 has limitations imposed on speed due to the force on the tailboom imposed by large pedal inputs (plus they had to create a pin to drop into the system to limit the physical displacement above certain speeds. (Sorry to be vague but it is 20 years since I flew a 407)