The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
I am testing it right now, and will post my findings here. Sofar it looks good, I need to be patient, and wait 1 day for the app to check the competition. Edit: 17 days now that I have the app, and it still does not work. Furtheron, it does not track items with the same name such as "cabinet". I wrote they should use SKUs. You cannot add competitors yourself, and it takes too long for support to do this. The 30 days trial makes sense now, because I already have 17 days without any results. The other pricing app pricemole is already up and in running in 2 days. I always test 2 apps in the same period, to be able to test which one I will keep.