The interface is not very intuitive. The UI can be buggy and stop responding. E.g. price slider can get stuck. This overly simplistic UI can be unhelpful too - why can I only filter shelves prices between $3 and $111 ? No way to input custom values at all. No way to to sort by review ratings, availability in selected store, etc. Update: shopping list just evaporated next time I opened the app. Review changed to 1/5. Update: 1.5 years later, nothing changed.