Love the Mach-1, have used them 100+ hours in my Archer and R22/H300 blenders (also with the custom ear pieces), great piece of kit.
As I am spending quite some time in my own aeroplane and I wouldn't mind reducing the noise levels a bit more, I've been thinking about fitting her with an ANR box that I can just plug into the intercom, does anyone know if such a thing exists?