For starters, virtually everything takes more button clicks than it should, and menu items are rarely where you expect them to be. If you try to circumvent that by long-pressing the top right button to get to Zepp Flow, you are in for a ton of lag. Sometimes it takes Zepp Flow eight seconds to respond. You can use it to control the music playing from your phone, but then you must have your earbuds connected to your phone, rather than your watch. Playing music should be easy.