Although tail rotors have less parts than Notar, the 500 series has a critical safety notice relating to the tail rotor.
In the event dual controls are installed, the second cyclic control is a risk of unhooking and removing a bra or bikini which when falling out of the aircraft, can strike the tail rotor and create a tail rotor failure. In addition, this hooking risk can cause a run away in the trim switch mechanism. This would be a tragic event and so my aircraft has the appropriate placard:
"BRAS AND BIKINIS MUST BE REMOVED BEFORE FLIGHT".
Naturally the Notar solves this problem....