Seems pointless and inconvenient for me as they usually seem to be poor quality, and can you really listen to music in the shower, and are you showering long enough to benefit from it?
Or do you own one and use for a different purpose, like swimming or Kayaking?
A lot of people don’t understand how much time long hair actually adds. When mine was reaching my hips it would add 10 minutes to my shower. I wasn’t even doing conditioner or anything; it just takes forever to get all of your hair lathered up and then rinsed out. Now that my hair is short again I’m in and out in less than five minutes, but I wouldn’t have minded music back then.