Various people have tried the QC-15 but it doesn't have anywhere near enough attenuation for SE piston aircraft.
My girlfriend and I had it on a trial a year or two ago (for airline travel). The ANR was crap, with a clearly audible hiss (which is not an uncommon issue with cheap ANR headsets) and the overall attenuation was comparable for a crap £100 aviation headset.
Comfy to wear but not much good for flying SE piston.
May well work in a jet or similar - if they have fixed the hissing. Bose did not comment on the hissing so we sent it back for a refund.
It's just a shame that the pilot shops have shelves full of headsets ranging from just-usable to crap, and this is what keeps Bose in business with such (IMHO) overpriced headsets. Bose are like Jeppesen - there is no choice but to pay up
