I just went to the audio show in Hong Kong, there were tons of people and the environment was kinda noisy actually. ECT is the new sole dealer (AFAIK) in HK and both Jerry and Andy were there. I had the luck to talk to Jerry for awhile and got a lots of my questions answered.
Jerry set the Roxanne bass to 2 o'clock for me to try. The treble was there but not harsh, and there was plenty of bass. The overall sound gave me a "full" and "wrap-around-you" feeling which is very enjoyable. The Rox does sound like a speaker.
Jerry said having more drivers do give a wider soundstage and the different between a universal Roxanne and custom one is whether you can have a good seal every time or not. If you do, the different is probably less than 5%, he said.
And oh he said CF has nothing to do with the sound , go for acrylic if you want to get Roxanne fast.