Takes too much time to spin during teaching because if all the buttons that need to be pressed and all the different screens that need to load. I often switch between team and student spinners, and it needs to be a one click function. Instead of choosing which spinner we want, and then a second screen popping up where we then press another button to spin, consider selecting and spinning with one press instead. Then touching the screen anywhere would then instantly take us back to the spinning screen where we can then quickly spin a different spinner. Or another possible design would be to spin all spinners at once every time. In any case, believe it or not, these extra few seconds really do matter when trying to maintain students' focus on what's happening in the lesson.