CP: Finao Boxes to deliver wedding proofs

Cross-posted from Weddings forum as this is more of a business question I guess. I want to offer a product where I print the photos (from SM of course!) and then deliver them to clients in these beautiful boxes rather than just send them out.

I love how these look and am planning to test these out myself:
http://www.finaoonline.com/index.php?option=com_content&task=view&id=122&Itemid=70

Has anyone else ever used these boxes / sold them to clients? Do they feel durable? If you do offer them, how have your clients liked them?