I bought M12s as replacement for (the original) SM450s, and I am quite happy. Full sound, clear and with some good load in the lows. I have been asked a couple of times already where I hid the subwoofer :-) when using them at small DJ gigs. Also very good for presentation setups thanks to the EQ. Two small design disadvantages: power in and signal in are not close to each other (- when using combi-cable) and there is no screw to tighten the speaker on the pole. Other than that: great value for money! And great Thomann service as always.