We have been using Flow since we migrated to Shopify Plus, we couldn't run our business without it. That being said it could be improved.
I have used this app to quickly and easily add complex automations to my business. This app has saved our business tens of thousands of dollars in saved time and money. I'd give it 5-stars if there were a few more trigger events, but they seem to be adding more and more functionality to it every day so I'm sure the list of triggers will continue to grow.
This is fairly useful - it's like Zapier w/ access to your SQL database. In fairness, it's currently more handy in theory than in practice.