Had to return. The smaller than normal keys along with poor (to me) key feel made this a bad choice for learning to play. The bluetooth was convenient in many ways, but annoying in others - a cable is easy to just plug in while the bluetooth requires you to connect to it from a compatible app before it's available. (Once you connect via an app, it's available to all apps even if the others don't have an interface to connect to bluetooth LE devices)
Love the bluetooth; Really disappointing keys