Gentleman,
My take on the difference in Sound between the DI's and Bill's crescendo's equate to the obvious difference in design and the drivers covering the majority of the midrange.I do believe that the crescendo's would'nt have the perception of speed but may offer a touch more bloom in the sound that Bill may prefer and likes better.
But Offcourse room size,toe in,distances from wall,and other variables can greatly effect the sound of any speaker as we all know.
I personally find my DI's not lacking anything for my tastes and most certainly don't find them fwd or lacking depth.I don't like a too laid back speaker and I greatly enjoy the transparency and speed that this design has.I enjoy zero toe in on my speakers I have tried many positions in my room and I found the best comprise in overall sonics by having them straight ahead.
At the end of the day we all should go where are "Individual Ears" lead us.No right or wrong either way.
The DI speaker for me bring many great qualities from other speaker topology's to my sonic presentation preferences table without the shortcomings of other designs that I have owned and heard in my 36 yrs in this hobby.
Kenny.