Masturbation is normal, healthy and there is absolutely nothing wrong with it according to the vast majority of doctors, scientists and psychiatrists. I would be far more concerned about anyone who claims they’ve never masturbated. If you are in a relationship and you don’t feel the need - good for you. Not everyone is in that same boat.
I’ve used it. It works great! Shuffle mode isn’t quite as varied as I’d like, but beyond that, it’s a really great music player.