So I guess the basic answer is that it'll almost certainly be fine once I get it adjusted properly, but there's of course no certain way to know that I'll love it until I try it...
Since the width is all in the back, I think it'll be OK. My sit bones are, best I can tell, in the 160-165mm range, so the extra space back there will be nice! The only saddles I've had serious chafing problems with were a Terry and one other women's specific type model, right at the part between nose and the rear portion.
Did I mention I hate waiting? So I jabber.
Thanks, Lisa and Mimi! And Sandra, I'll try to post a review and comparison with a standard B-17 as soon after I get it as possible!