Used them for over 2 years now. I would honestly stay far far away from this company. They have THE absolute worst customer service. And the product is broken as well. The inventory is constantly off, and this is exactly what you're paying for! It's no good. Also it's very expensive for what you get. I highly recommend against using Inventory Source. If you're using Shopify, just do an app search for inventory app or automated inventory updates, and you'll find a few apps like Stock Sync or check out Ecommdash as well. Good luck.