The pinch-to-zoom demo looks that way due to them using it in chrome, which is janky by design as it zooms in discrete steps. Later in the video they show some more granular controls such as rotation of objects and it looks quite responsive to me.
We probably have to wait for some more hands-on videos, but the product itself looks promising.
We probably have to wait for some more hands-on videos, but the product itself looks promising.