After listening to the EX speakers twice at HE2006, I got a chance to hear them for a third time. Turns out third time was the charm: they sounded much, MUCH better than what I'd heard previously. Curtis gave me the 'I told you so' look last night.
The previous time I actually wondered if they had been wired in phase, because I was having trouble getting decent imaging. This time, I could hear central imaging even when sitting off-axis. What a difference. It probably helped that they were well away from room boundries, whereas before they were almost against the wall.
In any case, I had new respect for these speakers. They have a nice, laid-back sound that I could probably listen to for hours without fatigue. I'm not sure they're worth 9K for the pair, especially with so much good competition around in that price range.