The newest addition to roland's "groovebox" line, the sounds on the mc-307 blow away the mc-303 and 505. The screen is huge, compared to the 303/505, similar to the RM1x. It also has a very intuitive interface, I was programming patterns after only a few minutes of fooling around with it at Sam Ash. I hope to own one within a week or two, and will give a more in-depth review then. This could be a serious competitor to the rm1x...
(Thanks to Justin Davis for this info.)
and Gianluca D'Attilia for the pic