Interesting discussion. I just bought Cornwalls (mostly on reputation) and the thing I was most surprised about is that I don't care about the imaging that much- they are used in my living room which opens to the kitchen/dining and are in a very compromised placement. But they sound fantastic as long as I just enjoy the music, instead of sitting in the sweetspot (such as it is) and focusing on imaging. Which is usually a hugely important thing to me. But I have multiple listening spaces and lots of different speakers/systems (I'm a recording engineer) and I just realized if I want holographic reproduction I'll go downstairs to the studio. The Cornwalls bring so much to the table that outweighs pinpoint imaging in my case.
All that being said- they image ok. It's not like you don't get a center image of the kick/snare or singer when they're panned dead center. Also, as others have said, the room and placement/treatment are pretty important if imaging is important to you.