The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
Still a somewhat new store. Tried a trial for one of the better services. After four days I still didn't have a report about my store. It kept telling me that it would be ready the next day. For startup shops needing traffic its hard to put all your trust into apps like this with high monthly rates.
My store: KNVRclothing.com
Really great search tool. It looks extremely professional but when I downloaded the app it messed up shopify's internal search function and whenever I search for anything it doesn't return any results :(