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 use a Sonos Roam. It’s the least-good-sounding speaker in my Sonos setup, portable, wireless, and waterproof. Works really well for shower music.
can confirm, life quality went up