Great that you like them. Not sure how they sound compared to the M3s. Unless Axiom changed the design, the M3 has a more sophisticated cross-over. It also has a published frequency response and impedance curve. So not sure the fidelity, soundstage and imaging is similar. These aspects are probably not as critical for most in the intended application. Surely not when you mount them side-ways.

Did you compare them against the M100?

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated