Fit appears consistent with the chart.  My left toe initially seemed to be just a little too close to the end of the boot, but the boots appear to fit well now.  No cramping or tightness around ankle, heel, or ball of foot.

They are extremely light and comfortable.  Tread seems more-than-adequate, and ankle support is excellent.

I look forward to testing them in snow later this winter.

NOTE: wearing a medium-weight sock.

UPDATE 1-21-2013:
Just got back from Helsinki.  Wore them on the flight over, three days there, and the flight back.  Very comfortable with exception that left toe seems to bump against the end of the boot.  However, the combination of *very light* boot with comfort, good traction, and warmth is impressive.

Would purchase them again.