QF CSV Shipping Rates

The reviews for this Shopify App are overwhelmingly negative, with multiple users reporting that the app does not work as expected. Customers have complained about issues such as the app not changing shipping rates, inability to upload files, slow and unresponsive customer support, and failure to honor the trial period. On the positive side, one user mentioned that the app was great for setting detailed shipping rates and praised the developer for being responsive. Overall, the app seems to have significant functionality and customer service issues that need to be addressed for a better user experience.