I decided to install these on my Avata 2, as YT videos indicated a reduction in prop noise. They are the Master Airscrew Stealth 4-prop.
I can’t fully confirm this, at least not when hovering. I used a decibel meter app on my phone and levels reduced by 1 db from 81 to 80.
As far as flight behaviour is concerned, time will tell. I’ll be able to take it out for a spin again next week. It currently is a bit breezy here in the Midlands. 
Apparently they make it slightly better when freestyling and flying aggressively, think some of the MAS ones though can be more fragile than the stock DJI ones though.
That’s a shame. The noise of the drone is one of my biggest concerns when fly around uninvolved people. I always try to stay high up so as not to disturb the peace. I’ve never encountered any hostile response though (so far). Only interest as to what I am doing.
I took the Avata out for a proper flight yesterday to one of my favourite flying spots in a field nearby. I noticed that the noise hasn’t really decreased, more changed to a more whining one. I couldn’t tell a big deal in terms of handling, but maybe I lack the flight hours and experience with this drone. I think I’ll change it back and keep the Stealth props as a spare set.
This is very true with the ones on the original Avata - use to use them loads - they fly better as there are quite a bit stiffer than the OEM ones but as a result a small bump will shatter them 
Gone back to the OEM ones as I got a bit fed-up of changing them just about every flight where as the OEM ones lasted way longer.
As for the noise they have a different tone and were not as shreeky so not as intrusive I felt.
That’s interesting. For me, it was actually the other way round. I found the MAS ones shreekier. Maybe something for me to get used to.