As always, I am curious about the efficiency numbers (not wordy descriptions). As usual, there are no numbers.
It looks like it has the capability to be made really light. The current design seems heavier than a derailer system. The rear hub needs work for this.
Looks like it could be almost completely dirt-proof.
It looks like it needs a special frame.
It uses lots and lots of extra bearings.
It uses far fewer bearings than in a chain.
The inventors need to show not innovation but a clear improvement on what is already available, from efficiency, cost and weight POVs.