We have 4 Boxe X headsets in our plane. We had the battery part built into the aircraft so the box that controls the unit. (Which is actually a slim little thing now on the latest ones) is empty.
Two things that I would tell you to be careful about..
1. If you have the Bose 'prep' in the plane. Be v. careful when other people use the headset. They tend to try to force the pins in and bend them. Also when they get out, I often have to remind them that they still have the headset attatched to them. If you don't they will walk of and destroy your headset.
2. Target for thieves! (ebay is a great place to get rid of stolen stuff without getting caught if your wondering where the market for stolen Bose headsets is!)
TD