Depends on your spending mood at the moment, buddy.
A-B'd them a couple weeks ago attached to some Cambridge kit, (shop demo 540A and 540C),.And while the Aviano was clearly great for the price, with nice detail very evident, the Mezzo's had a "thicker" quality about them. The wife, who isn't as into this stuff as I am, was quick to spot the difference. To me, that told the whole story.
I think the cost difference was somewhere in the range of $150.