Why didn't someone think of this before? As a commuter and runner, I have never before found a solution to dangling or tangled cables that works. Other devices either don't work, or if they do, leave this hanging weight which really hurt my ears after a while, especially running. This is so simple, and you only have the weight of the top bit of cable. Plus I use it to store my headphones when I am not using them, and they have lasted a lot longer as a result.
I got the black one, but I am now going back to add some more colours to my collection.
You have to try it!