QF CSV Shipping Rates

The reviews for this Shopify app are overwhelmingly negative, with multiple users reporting that the app does not work as advertised. Customers have experienced issues with uploading shipping rates, receiving slow or no response from customer support, and not being able to utilize the features even after installation. The lack of functionality and poor customer service have led to frustration and disappointment among users. However, there is one positive review highlighting the ease of setting detailed shipping rates and the responsiveness of the developer.