Thanks for the feedback, guys. I don't think I'm likely to run out and do anything rash like selling my De Capos, at least not yet.
That being said, I can't help but think about how the sound of the Maggies sounds more like real music to me. I agree that compared to a dynamic loudspeaker there is a much more diffuse sound to all of the instruments--almost a fuzziness around the edges of things and less definition and cohesion. But there's an energy and immediacy about the transients that I don't hear with my De Capos, and things come out sounding less like a hi fi and more like a live musical event.
In truth, when I go to hear a live concert, be it jazz, classical, or rock, there is almost never any real defined imaging from side to side, nor is there a razor sharp delineation between instruments. Sure, on a large stage I can tell the direction from which an instrument is coming from, but usually by the time the sound makes it into the hall or room I'm in, it's pretty well blended together. Actually, I notice front to back spacial cues more, but the Maggies I listened to conveyed a sense of the space of the recording wonderfully well. I guess it's about the Gestalt of the music, i.e., the sound as a whole vs. each individual instrument. Of course, I can appreciate the nuance and subtlety of an individual guitar sound or violin or whatever, but (again) the Maggies just seemed to bring me deeper into the music, as opposed to listening to the gear.
Maybe I need to upgrade the rest of my system to really get the optimum sound from my De Capos, but I suppose I could say that about any speakers. The question I'm still playing with is whether or not I'd get tired of the sound of the Maggies once the novelty wore off. I may take a pair home for the weekend and noodle around. I don't think I'd even begin to consider a change unless I was able to hear them in my room with my associated gear.