I am currently running Bose A20 in an Evo helmet and the results are variable. Brilliant helmet, absolutely love it, and when the ANR goes good life is great. However, depending on the aircraft, and flight condition the buffeting from the ANR can drive you insane...
different helicopters cause different buffeting at different times. One Jet Ranger is fine with doors on, but hell with door off. Another Jet Ranger is really bad with doors on, but actually quite good with doors off....
The hueys all behave differently, one fully enclosed with a bubble window is beautiful no buffeting so really good. Another one is ok with the window in, and no good with window out, another is the opposite good with the window out and crap with the window in.
I wish i could figure it out, but i just swap between ANR and CEP helmet, depending upon what helicopter I'm going to fly, and what I'm doing.