When we have barcode most of the cases we have item with us, isn't it? Then what is the use of getting the product information?
May be doing price comparison on top of this would be real game changer in my opinion.
The main use case I see is to quickly lookup a product's price with a dumb phone (or a smartphone if you don't want to install an app). It also sends back a link to the product, and the title of the product.