I'd expect the M60 to compare favourably with Revel's F206 and the M60HP with the F208. The M60 is also easier to drive than the 206 (not sure about F208). Careful with the M60HP though. That might be more of a 4 Ohm load. Axiom would know.

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