TB, power and authority issues aside the NOTAR does give you one big advantage over a conventional tail rotor, that of what happens when it breaks.
Conventional T/R will dictate where the coming together with the earth happens to a much greater degree than a NOTAR. Whilst it is acceptable to immediately enter autorotation and establish for an engine off landing, what happens if the terrain doesn't exactly lend itself to a comfortable bottom end?
With a NOTAR you can chose your contact point by continuing flight to a more suitable area before carrying out the "getting back onto earth safely" drills. A more suitable point could mean the nearest airport (fuel availability permitting) which will have full fire and medical cover. You may even have enough time to select an area (if airfield out of reach) and arrange with air traffic to get the emergency services there to witness the end result.
It doesn't necessarliy make the machine any safer than one with a conventional T?R but overall it does give me the warm fuzzy feeling inside to know that the ability to select the crash site lies more with me than the aircraft.