Wow I really want one, but I still really want a Pacemaker. The major difference is the price. The Kaos is 100 pounds compared to the Pacemaker which is almost 400 pounds. Yes they do different things but there both tackling the same problem (as such). To make things even more difficult, theres the Korg Mini-KP which seems to fit between the two nicely. Hey and how cool is it to hit the streets with a miniKP pas.