The DCM230 has an integrated docking function, meaning you don't need a plasticky dock hanging around your shelving. At £200 it's the most pound-thieving of all the systems on display and we really can't understand why -- the speakers squeak a comparatively meagre 15W per channel. Compared to the much cheaper MCM398D, 15W is just dung.
What this model does feature is a 'USB Direct' function which, apparently, plays music from 'every other' portable music player you can connect to the USB socket. Interesting. We'll believe this when we see it in action ourselves.