SwapUp review for Shopify Marketplace Connect

The app is very clunky. The sync with eBay is on-and-off. When it doesn't work, the app developer / support team has no way of figuring out why it's not working. Sync problems in turn cause other issues on eBay, including bad seller ratings due to inability to fulfil orders as a result of inaccurate listings, and shipping details not updating, leading to negative customer experience.