As of today 8/29/2023, some of the report syncing ceased to function and it's seemingly impossible to get a response from Google about what is going on, so my current rating is 1★, but under normal circumstances where this tool is functioning as intended, I would give it at least 8★ out of 5.
I absolutely love this tool. With the overly complex object structure our organization has, sometimes it's challenging to combine cross-object metrics in a single SF report/dash. This tool has made it incredibly easy to sync the individual scattered reports from various objects in a Google Sheet where, being a spreadsheet nerd, I can way more easily do anything I need to do with my data to tell a compelling data story.
Once I have a clear understanding of what's going on, I'll absolutely update my existing review.