Instruct: Classify a review into positive or negative sentiment.
Query: Worked well...but not for long.

I had the predecessor model to these headphones for 7 years until they finally gave out last year. After tons of use and many miles of running, I felt that those were a great value, plus they sounded decent.When I went to purchase the same model, I found that they had changed slightly to this newer version. The design was identical so I went bought them. Sadly, Sony's build quality which I thought was wonderful, is not up to par on these headphones. Yesterday after 8 months of ownership, these headphone stopped working. The right side speaker no longer functioned and slightly twisting the speaker brought the sound back momentarily. By the end of my run, the right side speaker was completely dead.Now I see that Sony no longer sells this style of headphone. I guess it's time to move on to a different brand.