It seems to me the big challenge with a (single mid driver) 3-way is, if you push the crossover high enough that the mid is radiating at 90 degrees to match the waveguide won't just about any high-efficiency mid start getting in trouble with breakup? And at the same time CD is not being extended down to as low a frequency as it might be? (assuming lower pattern control = always better). It's certainly possible I have imbibed too much of the Controlled Directivity kool-ade lately, but I've been under the impression that the way to go in a premium speaker of this type will always be the best 12" - 15" mid/woofer you can afford, paired with the best and most extended tweeter available, with magical synthesis happening in crossover treatment.
Am I wrong?