Originally Posted by
aTomatoFlames
When you have the UFLYMIKE set-up you can take it off and just use the QC15 like normal headphones. So if you're sitting at the airport or commuting in the back you're not using your A20s

to listen to music.
Used QC15's are going for cheap on the interwebs lately. A buddy of mine just picked some up on Amazon for 150 and they look brand new. They are getting a little more scarce since Bose stopped making them for the QC25. If you're on the fence I'd wait till uflymike comes out with his QC25 piece. Apparently the 25's will still put out audio when the batteries die unlike the 15's going crickets. Just my .02