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And presumably, the spacing between each gear on the back is different, and therefore the shifter must be specific to any one "cassette".
I think they also missed a trick with making it compatible with a normal freehub body. Surely one of the major advantages is that it is flat, and therefore the rear wheel can be more symmetric?
chiroshi
No mention of the friction in the driveshaft. Would there not be a twisting load on the shaft from the chainring pressing aginst it? The system needs a mechanism to move the rear driver back and forth. More friction.