Basic functionality ok; no keyboard control; saving doesn't work
Speaking strictly as a metronome, it works fine. That's not a big lift these days, however. There's no means to control the start, stop or tempo changes from the keyboard, which would be very useful to avoid having to grab the mouse. Saving tempos works, until you quit the app and your sessions previously saved tempos are all gone. These issues seriously limit the practical functionality. It's free...