Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 15.5 years of flawless performance.

I have owned this set of headphones since the summer of 1991 and they still sound as good now as they did when I purchased them. They were recomended to me buy a local radio DJ and I picked them up at a high-end audio shop locally. I think back then I paid nearly a hundred bucks. I have recently replaced the pads due to age, but other than that perfect performance.