If you are a drummer this is a no brainer. I was skeptical at first, but after testing on a tune in 7/4 I was playing with a group, I was sold. Pro drummer, covering multiple genres, and this app is my best friend. Great practice tool, excellent gigging tool...this lets the pocket breathe to your personal feel. Sure a metronome is a great static representation of the time, but this to me personally is a greater tool, letting you know how much your time alters throughout a tune. Very accurate. My only request ( a crazy one) to let the app drive a metronome through something like audiobus, at a user chosen interval( metronome bpm adjusts over a set time or number of bars) to allow the click to be fed to others.