Now have both Bose QuietComfort Acoustic Noise Cancelling Headphones, the i15 and i25 to. Both contribute to super, and are processed the same very solid. The batteries last for loose 40 hours (more than 3 Asia flights there and back), so you really should only have a spare battery with. The sound of both headphones I feel the same, have you may find counter Heard and no differences. Of course, not noise-reducing headphones same quality cheaper, with the i15 and i25 Bose has one but in absolute terms, two very clean sounding headphones. Advantage of the i25 opposite the i15 is that it also when the batteries still plays music, but the sound will be somewhat muffled. Another advantage is that the travel case of the i25 is smaller due to the new folding mechanism the headphones, as the i15. The brackets for the adapter and a spare battery in a case is made smart. However, now against the i15 no room for my charging cable and the iPad nano; the need to stay out. All in all: super noise reduction, comfortable fit, great sound, long battery life.
