The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
I've used the app to show the shipping rates on the cart page and hopefully reduce abandoned carts at the checkout. I'm also using the a bar to show "spend X to get free shipping". The app is fairly easy to set up although I did find I wanted to customise the look and feel which meant a bit of backwards and fowards to getting it to look exactly how I want. I reached out to the app developer for help with 2 things and he was prompt and really helpful. Overall, very satisfied.
Thank you so much for the review! We're always looking into ways to make the setup process easier for more types of themes. It's definitely a work in progress and your feedback is highly appreciated!