this is what we've seen as well. it validates that whatever price, promo, shipping and taxes you've put into your feed is what ends up in the final checkout and there's no bait-and-switch going on between the feed and reality.

it's rather annoying because it creates dozens of "abandoned" carts per day which we have to continually clear out (based on Google's known ip address ranges) so our reps can go through actual abandoned carts.