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?
I know great (not excellent) sound quality and Bluetooth devices can be very good! I have a JBL Flip, and I have bone conduction headphones, and I have some Bluetooth earbuds. All are pretty good, but the bone conductions are my favorite.