Hey Scott. No I have not, but I have heard very point source speakers like coaxials and full rangers and I fully know the grand benefits of point source sound. I've touted it quite a bit on these forums. So I don't doubt very much that you and beast have phenominal speakers.
What you have stated in this thread is that you place a higher importance on the FR at the LP where as I place highest importance on the anechoic FR with uniform polar response. Even in my own room where I can control the LP frequency response. I typically prefer a wider polar response than something to narrow also. So from my position, I agree with Face that there is room for improvement here, despite the incredible benefits a synergy horn provides. I think those benefits do out weigh the FR abnormalities.
There's way to many variables to accept your statement that some good speakers have bad FR and some speakers with good FR sound "bleh". There's a myriad of reasons why this may have been.
JUST to be clear. I think the synergies are probably mind blowing. I just think in the home setting I'd want to improve the FR.