No and I don't think it ever was meant to be. Is that bad? I actually think it's quite a good thing. Let me 'splain you
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The top surface is a touch surface so therefore it's not designed to hug the contours of your palm. Rather, it has a low profile designed to be guided by your fingertips instead of your palm. That way, the white surface is cleared off your palm allowing your finger tips access to it's multi touch surface for various gestures. Once you get used to the mouse being a "fingertip controlled" mouse instead of a "palm controlled" mouse, it performs exceedingly well.
The top surface is a touch surface so therefore it's not designed to hug the contours of your palm. Rather, it has a low profile designed to be guided by your fingertips instead of your palm. That way, the white surface is cleared off your palm allowing your finger tips access to it's multi touch surface for various gestures. Once you get used to the mouse being a "fingertip controlled" mouse instead of a "palm controlled" mouse, it performs exceedingly well.