As a drummer this is the best and most advanced metronome on the market. It is also easy to use! You can customize any number of back beats, which makes it easy to practice polyrhythms.
You can create custom set lists, so when you are out at a gig or rehearsal, all of your programmed tempos are ready to go and easy to switch between.
Few things I would recommend: an OSX version for my computer. Rearranging songs in the set list could be easier. Also have the set lists sync between devices. This way if the battery on my iPad dies, I can easily shift to my iPhone, and not worry about making a new set list.