The sound reduction is phenomenal.

Comfortable, excellent noise reduction and sound clarity.

My old set has better passive noise reduction, but it's a whole new world in the cockpit with this new ANR headset

Should the batteries die the DC’s are very usable with their passive noise reduction which is much more than what the Bose A20s can offer

I suppose the question boils down to whether the DC's have "good enough" noise reduction, and this depends on what you're flying and whether you prefer as close to silence as possible or to hear a little ambient noise

First, without turning on the noise cancelling feature, I'd rate the passive noise reduction as good - very similar to my H10-20's, just more comfortable

on” you immediately notice are remarkable reduction in none essential noise