I've been using music for years to improve my focus, relaxation, sleep, happyness, sadness, social relations and many more. Music make us feel things, we all know that. For me it's out of question that it can make you better, speaking broadly.

Now, having brain.fm picking the music so I can feel X seems like a step backwards. I already can do that but much better just using the wonderful universe of existing recorded music.

I don't see the value for me here.