I have the previous xm3 model. These headphones are clearly intended for users who want noise cancellation. If you don't want that, you shouldn't buy these.
I find the SQ in active NC mode okay, but the noise cancellation and comfort are top notch. If you are in a bus, train, plane, car, or other environment with lots of ambient noise these things are great. Prevent noise fatigue and are enjoyable to listen to.
Just for music listening, I'd buy something else. I have a pair of custom fitted IEMs that in terms of music listening only are far superior for about the same price. But I prefer the Sony's when outside the home b/c of the noise cancelling. It works much better than even the isolation of the custom IEMs.
The battery lasts close to 30 hours in playback with noise cancelling, so that isn't an issue.