@John: Thanks for checking these out. Perhaps a typo on their website then? I was going to add a MontBell jacket to my stable for the upcoming mountain season, but for near the same price, I think the Daybreak jacket might be the winner. It's definitely competitively priced (hardly more than First Ascent's Down Sweater!).
@Konrad: GoLite advertises Pertex Shield, not Endurance UL.
Regardless, Pertex Endurance is a 1.3oz WP/B fabric that I've seen before – the UL version looks new. At such a feathery weight, it can't be WP/B, right???