I've got a pair of SM150's. I'm in the process of re-edging the woofers (what fun!).
I find them to be good speakers - there are no "dull" spots throughout the frequencies.
I'm driving the units using a JVC integrated amp (yes, they did make them, but the name "JVC" does not have the name associated with half decent stereo equipment - they stopped making integrated amps in the early 90's).
If you can get them at a fair price, then you should buy them (you also might want to insulated the cabinets - your choice).