I purchased a Dinatronics Sport module for my F56 Non S Mini in July of 2017. They unit failed in early December of 2017 after 5 months. I contacted DINAN several times by telephone and after waiting for return calls that never occured, I finally got through to the warranty manager Joe who provided an RMA number to return the product and have it bench tested, verifying the failure. I have now been waiting for over 3 weeks after confirmed delivery to DINAN. When I called today, I was told that "they are really backed up with warranty" work right now, and, was routed to the same guy that won't return my calls or e-mails. I will never buy a DINAN product again. Poor quality. Poor customer service by everyone I have contacted.