250 is spot on, that button is there just to make you feel good. Not only doesn't it erase, but it will tell them how many times you tried to erase!

Another thing to think about, does your company require (like mine) that any headset used be TSO'd? I don't think the QC2 and uFly meet that requirement either.

The Clarity Aloft Pro does, and it has the input, just don't talk about it, cuz they won't hear it, it isn't on the mike circuit.