Re QC15. Just be aware this is great for a Captain but highly compromising setup for the FO or RHS pilot.
This is because on ground with "one ear off" as required to talk to each other, the mike is always on the Lhs (Cannot be changed) and therefore moves to wrong place as you uncover your ear facing your colleague..
Indeed if your colleagues generally don't use the aircraft intercom in flight the uflymike is an absolute disaster if the RHS needs their left ear uncovered. If you are using intercom in flight it is just workable but far from ideal overall.
I know several FOs in 737s who have tried this setup and they all gave up on it.
The only issues for LHS pilot are the well documented need for batteries for comms.. No power = zero comms ouch!
These are great half price solution ANR headsets though.
I have purchased the A20 Bose with XLR5 (so called Airbus plug) direct. I say so called as all new Boeing Jets have the XLR5 plug as standard including 737NG's, although I think the operator can still specify dual socket fitment if they really want to.
The A20 is excellent. Powers ANR off aircraft, no batteries are fitted inside the headset lead box. I thoroughly recommend this to XLR equipped 737 pilots if your budget can stretch. If you have a mixed fleet of GA dual socket 737s and XLR get the XLR version and relevant converter back to dual plugs.
That way you can at least power ANR off the aircraft fitted with XLR sockets.
Hope this helps.