Book Curl review for Shopify Marketplace Connect

Unfortunately this app doesn't work for medium sized sku counts, and and above. I have been trying for a few weeks to get the listing to synchronise from Shopify into the app, speaking with the support team, but this keep failing with various backend errors. There appears to be no initative to fix this or provide support - all I get is responses that say they can;t tell me when they will resolve this. This all seems pretty fundamentally lacking to me. I am afraid I cannot recommend a system that is this unreliable. We will have to use an alternative solution.