I played with the MM6 at sound expo (equivalent of Namm in UK) and I wasn't impressed one bit. The mo6 blows it out of the water and if you are looking for something in the price range of the mm6, you are better off with the korg x50 or roland junoG. If you can afford the regular motif es, get that instead, but stay away from the mm6. To me the mm6 is an over glorified casio type keyboard.
But isnt the MM6 just a smaller edition of the MO6 with the same sounds? Like the MPC 500 is the little brother to 2000\1000? I can understand what u r saying about MM6 being a casio-play-keyboard, cause I saw the demonstration with the dutch guy. He played it like a kid's toy, hehe, I had a good laugh though .
Anyways, do u think I can get a used MO6 for the price of MM6?