Sweet! Can't wait for more people to start using grey matter more... To answer you question about my preference.. for starters you dont need to have a paid spotify to use grey matter. It seems like with humit you need a spotify account to get into the app. I have a lot of friends that dont have spotify so grey matter is working better right now for us. Also in grey matter you can also search for songs in apple music.... i think they are going to connect to soundcloud and bandcamp sometime this year too which would be REALLY awesome. Hope this helps!