This reflected my experience with the personas also. The three dimensional imaging was almost non existent. There is a dealer on here who pushes them so I am sure he will jump in at some point.
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.