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I'm already starting to get used to it. Being able to shift whilst not pedalling and dumping five gears, great when you want to stomp on the pedals when going into a steeper, faster descent or shifting to an appropriate low gear when coming into a climb is great.
Again, the central position of the weight in the frame really does help handling. You seem to pivot strongly around that central mass whilst manoeuvring on the trail.
Just expanded on my answer a bit above. Pinion is interesting. You can dump a load of gears in one go, going from 1-12 and back in one full sweep of the shifter. Well, at least conceivably. I can dump a few whilst shifting but it takes a contorsional twist of the wrist to achieve a full 1-12 sweep.
I'll write some more about it all after the demo is done.