Throttle Designs review for Shopify Marketplace Connect

I would consider myself a heavy user, this app in the beginning really shot me to a new level in revenue. However, with recent Amazon API changes, nothing seems to work and support (while kind of helpful) can't seem to fix the issue. I haven't been able to successfully list a product in months. Images seem to break, errors left and right that nobody seem to know how to fix. I hate to write a bad review from these guys because of how good things once were but as of recently, I can't recommend this to anyone who relies on Amazon. eBay and Etsy tend to post product just fine