The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
Installed the app. I had 2 problems: 1 it kills wishlist functionality in collection pages. 2 it does not work in a featured collection on your homepage. So products shown on your homepage via a featured collection, behave differently than products shown on a collection page. I decided to delete the app since uniform behavior of functionality on my website is key.