When I replaced my Bose QC 15 with a pair of QC 25 last year, I reviewed them here on the blog. They recently started acting up. Rather than have them repaired, I paid the difference, and took home a pair of QC 35.
I recently replaced my well-used and much-loved headphones, a set of Bose QC 15’s, with a new set. The old set was getting on a bit in age (I’ve had them for close to five years now), and were getting to a point where they were more or less worn out. Though they probably had another four or five months of heavy use in them, I wanted to replace them now, rather than having to scramble to replace them later. After looking at the offerings out there, I opted for their successor, Bose QC 25.