Tempo 1 was awesome (basically a Korg MA-30) But tempo 2 is like having a mini Dr. Beat in your pocket!!! I'm doing a video review of it to put on my website soon. But for now you can look at the tutorial video on their site (their examples are a bit far from practical, but it does show the features)
Plus if you have students they can buy it for 3 bucks, waaaaay cheaper than buying an actual met!