ive seen it but it really isnt that interesting at least to me. it kinda reminds me of the kaossilator. it would be nifty to just chill and sit with it but as far as using it for production purposes eh not for me.
For everyone who has an MPC the XR20 seems useless to me. Every mpc user can do the same thing and even sample it's own drumsounds. Not even to mention the other things mpc stands for. For a guitar player who likes to practice on a drumloop this thing is great, but for equiped beat makers this is nothing intresting.