Bose released the Quiet Comfort 15 noise cancelling headphones back in 2011 and they’ve been one of the most sought after NC headphones since. A little over three years later, they have released an update and official replacement called the Quiet Comfort 25.
Essentially they do the same thing. Both sound good, both offer great noise cancelling, both run on a single AAA battery and both are very comfy. Feature-wise the only notable change is that the QC25s now continue to work passively if your batteries run out, though the audio quality drops fairly significantly.
Overall, they’re a solid update. Nothing is revolutionary but everything is improved and I like them. The colours are great too.