I agree with others that using a down shirt/jacket for hiking is tough considering the high price and moisture issue in that application. A light fleece seems like a much more durable, moisture resistance, and CHEAPER option.
I am less worried about mositure & wind resistance since I would combine it with a wind shirt or rain jacket. I think that provides a more versatile system.
Regardless, the higher price of the Patagonia down shirt is the only reason to completely eliminate it from consideration.

