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?
Every single shower. I fire up whatever podcast I’m in the middle of and between the shower, towelling off, moisturizing, and whatever else, it’s long enough to be worthwhile.