Flexify: Facebook Product Feed

Paid premium for this app and had a very similar experience to Mullica Beach (see below review). We have a very large inventory and unfortunately the sync is very buggy, our "match rate" on Facebook fluctuated tremendously and often fell off a cliff, costing us time and money. When the sync works, the ads are very cost effective. Unfortunately, email back and forth with the developer yielded very little - terrible support - and we were referred to Funnelboom, who almost immediately stopped answering emails. Incredibly unprofessional and incredibly frustrating.

Shopify, please integrate dynamic ad support as a core function. Please!