Robin kind of got it nailed. Also, Srajan's conclusion about the different models and their overall design goals and signatures are on the money as well, as far as the models that I've heard with our gear that is. You have to familiarity, or otherwise others are just talking out of their, you know what.
However, I also have to put it in perspective. These are rather slight differences, not day and night, so maybe my statement was a bit over the top. The one thing about Scan speak's is that I have yet to hear a really bad speaker (for my taste) with Scan's. Those drivers are so balanced and have this seductive, emotional quality that it is hard to screw them up.
BT, just call me, because otherwise I'll be still writing in a couple of hours.
Late,
Klaus