When I found that you can swap between decks in a split second by holding shift and giving the encoder a quick turn, my head literally exploded, as did my pants. Sweet jesus this thing is beautiful! It feels nice, it plays nice, you can do basic finger drumming on it.
My only gripe is that you can't "punch-in" a one-shot over a loop, which is to say that, if a loop is playing, you press another cell in the column, it plays that cell as long as the button is pressed, when you let go it goes back to playing the originally playing cell. That is literally the only thing stopping me from buying another three of these right now.
EDIT: Whilst I'm waiting for the free sets to download, does anyone know of any dedicated forums or sites concerning remix sets/samples? I know beatport has a section, anywhere else?