Grand Wazoo makes a great point about the evenness of sound across the strings. It's hard to explain but you don't appreciate how different the B,E & A strings sound to the D&G on a normal bass. With the Dingwall it sounds like every string is being played on the same instrument, same presence punch & sustain. What I appreciate most about this is that eq'ing the amp stops being a compromise between tight enough to make the lower register sound clean but no so tight as to make the high register sound nasal.
Oh, & Sheldon Dingwall seems to be a top bloke. It would be very easy for anyone making such a great product to disappear up their own arse about it but he seems totally grounded & interested in what all his customers have to say.