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Extremely smooth! I can't comment on the c-spine issues but I'd argue that it's the smoothest driver I've ever experienced. Surely they have some math in their AI driving code that clamps acceleration and jerkiness. It's NOTHING like Tesla Full Self Driving, which I find to be incredibly jerky for both steering and acceleration.

Why are they more expensive?

Likely because they're not pricing based on their costs, but rather what the market will bear.

Although they have a lot of R&D to recoup, so that's a cost.

Also, perhaps it's a consequence of limited supply. If the SF fleet is still just 250 cars that seems quite small to me for a city with a lot of demand for ride services.

much smoother than the sf uber teslas that all have jerky regenerative braking on