I ordered cards with a blank back & paid for next day delivery... they "shipped" the package on a Thursday but didn't actually take it to the post office until Saturday... and they printed their logos on the back :| No response on a refund either, of course.
Tip for consumers: They'll not send blank backs! You'll have their logo on the back unless you actually get another design printed. Can't use the backs for personalized notes for each recipient.
Products used: Flat cards on velvet cardstock with single side print & blank back