I just got the A20s this last summer after 7 years with Telex 850s. I liked the small size of the telex, but in terms of quietness the A20 are a different world.
It took about 2 trips to get used to how quiet they are, can't hear engines running after start at idle. Now I did have an issue where the right ear ANR would cut out, like a loose wire, when my head moved. I called to send them back and within 24 hours of them receiving it they had shipped it overnight back. I was pissed that within 6 mos. I had issues with a $1000 headset and they have no loaners, so I had to use a telex 750, no ANR, for 2 trips. With no ANR you realize how LOUD the 737 is! Other than that hickup they are life alterring.
It took about 2 trips to get used to how quiet they are, can't hear engines running after start at idle. Now I did have an issue where the right ear ANR would cut out, like a loose wire, when my head moved. I called to send them back and within 24 hours of them receiving it they had shipped it overnight back. I was pissed that within 6 mos. I had issues with a $1000 headset and they have no loaners, so I had to use a telex 750, no ANR, for 2 trips. With no ANR you realize how LOUD the 737 is! Other than that hickup they are life alterring.