In turboprops, there are two kinds of pilots: Those that have the Bose X, and those that want it. Nothing else comes close, and trust me, I've tried a bunch of different headsets (including the piddly UFM/QC2 setup).

That said, my Bose X has been a maintenance hog of late. I've had to send it off to Bose 3 times in 3 years, and I'm outside of warranty, so it's $175 for a full refurbish every time. That said, they have comped that charge 2 of those 3 times. FWIW...