I have no idea about the tweeters. But I heard one of the persona's at the last RMAF. And I heard an extremely good sounding speaker even under show condition's.
Paradigm persona vs. Monitor audio Platinum
Just listen to the paradigm persona 7h.the monitor audio Platinum 300 generation two are so much more three-dimensional and open it's not even funny the paradigm sounded very two-dimensional compared to the monitors that MPD Tweeter puts the beryllium Tweeter to shame.