The reviews for this Shopify app are overwhelmingly positive, with users praising the excellent customer support provided by Adam and the efficient functionality of the app. Customers appreciate the quick responses, helpful assistance, and prompt resolution of any issues that arise. The app is described as easy to use, effective in boosting sales, and customizable to fit different store needs. Users highlight the seamless setup process and the ability to offer free gifts with purchases, which has led to increased average order values. However, there are a few mentions of minor hiccups during setup and compatibility issues with certain themes.