Users appreciate the plugin for meeting specific needs, particularly in extending delivery times for various products, which is crucial for certain businesses. They commend the exceptional support, highlighting how the developer, Mario, promptly added functionality beyond the original scope. Users also value the accurate delivery time calculations based on product classes in the cart. The plugin works well for different delivery scenarios, including mixed product classes. However, some users report issues, such as the delivery days not reflecting on the product page and being unable to reset additional days to zero. The plugin may also not function as expected with some configurations or product setups.