Printbest: Print on Demand

I have had so many problems with this provider that I have ultimately lost more money than I have made. The main issue is that they don't provide tracking details back into Shopify, or even email me with them so I can manually add them. I have to submit Contact Us request from their site for every time I need a tracking number, and even then I rarely receive the tracking number in time before a customer initiates a chargeback.