The QuietComfort 15 headphones ($300) are Bose’s newest noise-cancelling headphones. I had two of an earlier model, the QC 2, because when they broke I couldn’t bear to be without one for two weeks. I used them while walking on my treadmill and riding the subway. BART is noisy.
The model numbers went 1, 2, 3, 15. And, yeah, the QC 15 is much better than the QC 2 and QC 3, which were about the same. The first time I wore them on BART, when I got out of the subway I noticed I didn’t feel exhausted, the way I usually did after a subway ride. I felt normal. The noise had been exhausting.