I, and many others, who suffer from food allergies will be unable to use this service fully. Many products ingredient lists dont contain the allergy statements about what a product may have contacted. Other products dont have ingredients listed at all.
Otherwise it seems like a great app. Ive known about the service for a while now but just took a closer look via this app. Very easy to browse products. It may be limited or unavailable in your area though.
Mxbrn about Grocery Gateway, v1.0.1