ShipStation

When it is working fine, it is a treat to use. Integration with our Shopify store is a must, and it usually work great. Lots of features and integrations with carriers. Structurally, I have little to complain about. However, the app is glitchy sometimes. Various pieces stop working for short periods of time, although their "uptime meter" claims everything is A-OK. More importantly, however, their service has been getting sloooooooow. I've had 2 tickets open for days, and nobody has helped me yet. One of the tickets is essential to our business to be tended to immediately, yet... crickets. The service was always a bit lacking, but by this point they badly need more support staff.