unime, just realized you own one of these. Nice!

So, hope you don't mind. I have a few questions. You're the first Optibike user I've come across on the boards.
- As I posted above, how is shifting under load? Do you turn off the motor briefly for shifting?
- How's the noise? Is there an audible high pitch whirring sound?
- How's the cadence at high speeds? The default gear ratios don't make it easy to add pedal power at the higher speeds (25mph or higher)
- How many watt-hours per mile do you say you typically use? I have a Bionx system and I generally use about 8-9 wh/mile usually averaging about 20mph (battery capacity in watt-hours / total miles traveled on single charge).