FYI, I have heard the 180v4 as well. I honestly did not hold out too much hope for it when I first saw it on the Axiom site because I really did not like the sound from my 150v2 and the driver configuration is similar. However, it is nothing like my 150v2. You can have full confidence that if you go the 180 route, it will sound terrific.

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