spikejoneswrote a review of Gore Bike Wear Power AS Jacket - Men's on October 6, 2015
Familiarity: I've used it several times
Fit: True to size
High quality. Fit is slim but no more so than other bike clothing. Actually I would say Gore Bike Wear runs a touch larger than Castelli. I have a 40" chest so I have to go with an XL, I hate tight under arms...but this size is pretty normal for me.
The AS (Active Shell) fabric feels slightly rubbery like an ultralight rain coat. There are patches of softer fabric under arms and back for breathability and stretch. This looks like it will work well in wettish weather but too much road spray would soak your back.
Easily fits into jersey pocket, but is slightly larger than the Sottile.