Slumber Cloud review for Shopify Marketplace Connect

I wouldn't say that Codisto was perfect or a 5-star app, but Marketplace Connect should have never been released in the stage that it is currently in. I have attempted to submit ~5 new products with multiple variants to Amazon through Marketplace and haven't been successful once. There is always an issue and customer support just provides me with the error codes and no real solutions. The app can't find matching SKUs, variants aren't paired together on Amazon, and missing mapping fields cause errors but aren't updatable to name a few.