It might be the best at what it's doing. I like the possibility to edit what the emails to the suppliers will look like. And it's great to be able to set triggers on all things conceivable. It is too expensive however, that's the big problem with Shopify. App creators don't hesitate to charge almost as much at the Shopify subscription for just a tiny part of what I get from Shopify, which in the end makes Shopify really expensive. I think 9,9 would be an OK price. 20 is not an OK price for this.
For me I would really like if the app could generate a supplier portal link where the supplier could enter tracking code for shipments and by doing so automatically fulfill or partly fulfill an order. Then it would be complete! Well OK it would be complete if it could also place orders directly with other stores (magento and so fort), but that's more like a dream :)