Dave,

Lotsa batteries.

Ok, reality check. The Bose (as the DC) has auto-shutoff when not worn.
The batteries will last, what, 30 hours? You fly how many per year?
Let's say you need three sets per year, maybe five. That's "lots"? And
there'S a warning light before they run out.

No dealer has offered the Sennheiser for test, and the local
experience with Lightspeed is not good. Work as advertised, but
spend far too much time on FedEX aircraft.. to and from service...

Ah, the magic of marketing...

--
Thomas Borchert (EDDH)