PDR,
I did say that the Rotodyne was far ahead of its time. Don't forget that the aircraft was designed and flying almost sixty years ago!
It is generally agreed that the rotor tip jets were very noisy, but in truth were only lit for takeoff and landing. Modern technology could no doubt considerably reduce their noise footprint, as it has with other aircraft engines, bearing in mind that the similarly noisy turbojet engines of that time would not pass muster today, by a very long way. Same with the noise of the thrust engines and their propellors.
The Rotodyne had an incredible payload/APS weight ratio compared to any helicopter, even by today's standards, because it lacked a main rotor transmission system and had no tail rotor. It could also fly at speeds that would still be seen as highly respectable today.