I flew with a crewmember who was wearing one, a few days ago. He got his within days of ordering.
We had a check airman on board who tried it and immediately decided he wanted one. Another crewmember tried one, and immediately ordered one when we landed. He subsequently cancelled the order, because Bose told him it would be January before he could get it.
I tried the headset out; comfortable and nice, and just what one would expect from Bose.