Before we used Easyship, we provided flat rate by country which was difficult to price. Easyship's App allowed us to provide more options to our customers. Most important of all, it informed them with accurate tax and delivery time information when they make the purchase, so THEY can decide whether they want to spend extra for faster delivery. Data from Shopify syncs seamlessly to their platform with no data entry(no mistakes!!) and fulfilment is relayed back to Shopify. You can also remove shipment options by setting rules. (ie Exclude Courier A in a particular country because you have had bad experiences with them). Aside from convenience and a better customer experience, their rates are competitve which is important to a startup like us.