I hear this a lot (pun not intended). I don't think its for everyone, however when I get this feedback and then people try it out they find that the voice is much more relaxing then they thought it would be. The music bit though is very polarizing. Either people love it or hate it.Makes sense.
You'd have to pay me a lot to use one of these, however. What I DON'T want is noise underwater, especially including music and somebody talking to me.
For me personally, I never want to look at a screen when I dive. When I'm underwater I want to see the natural beauty, not the same screens I look at 8 hrs a day. This is more relevant to freediving/spearfishing as your dive times are shorter and you may not be able to look at a screen due to having your hands full with a speargun or a camera.