LitCommerce eBay Etsy Amazon +

Great and simple to use user interface with clear instructions on the setup process.
We had complex queries for specific requirements of our Shopify store, and the support team were great at helping us diagnose a few self inflicted setup issues.
They even worked quickly to add a new feature to their app to help us with our requirements.
We're now looking to expand our use of LitCommerce to our other Shopify store as our experience has been so good.