Right now it is quite difficult to give you an objective review. The weather here is very bad 3°C and it is raining a lot. The only thing I can say is compare to the previous M3 E46 - SMG II I had, the new one seems to be much better. You can configure it in many ways (maybe too much), it took us (me and the reseller) more than one hour to look at few parameters, apparently the M-DCT has also a special feature called 'Shift Light' telling you the best time to change you gear.
But again give me more time and I'll let you know.