Hiff Eff. Full Range Fostex Driver question

I am intrigued by the recent buzz on the Cain & Cain and Omega speakers. I talked at length with Louis @ Omega yesterday and am thinking about the Grande 6s. Has anybody replaced much larger and expensive speakers with something like this? Of course I will be buying a sub to augment the bass in my small room because I do like to listen to rock/metal very loud sometimes. Will the Omegas pull this off, or is this just wishful thinking? Current speakers are Montana SP2s which I absolutely love. But I am curious about the attributes of a full range, xoverless design. Am I a candidate, or should I just shut up and be ignorant and happy?

Oz