Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

This was the biggest waste of money ever created. If you want to know the song that much, call the station and ask them, they don't mind, really.
Negative

After trying three different sizes,I still couldn't find one that fit. I first ordered a medium and it wouldn't even come close to hooking so I went up to size to xlarge which was waaay to big, my last possible option would be a large and it was still huge, wish I would have sent it back but was just tired of the whole process and kept it. The hooks are a pain as well and it is way over priced.....there is a zippered option on amazon that is much cheaper.
Negative

I've noticed very little degrading of the sound, if at all, and this is rare in most extensions. The cord is thicker than usual for both the positive and negative polarities - a separate wire for each - and I'm quite pleased with this, will perhaps get another because of its thickness. I now have great headphone sound within a twenty-foot range - just what I was looking for. Even if you don't need 15-feet of cord, I would recommend this over the shorter 10 foot cords where the wiring is about half as thick and not likely to hold up over time...I subject all my electronics to heavy use. Plus, the best extensions for Grado headphones go for $40, and I'm quite satisfied saving over $30 by having this one.
Positive