John T wrote:

Be sure to include an opinion on the passive performance of the Bose.

In my experience of about 500 hours with the Bose, the passive performance
of the headset is just barely marginal, and certainly not ear protection
with which I would want to fly for any length of time. Fortunately, the
less-than-stellar passive performance serves as an excellent reminder to a)
turn on the ANR immediately at engine start-up, and b) always carry at
reachable length several extra AA batteries.

--
Peter