What is worth a minimum of 5 star, the service is from OKCS. The defect I have - after the cable had been very, very quickly delivered - discovered on Saturday morning during testing. I OKCS noted via email and then I moved to the city to provide replacement equipment. When I got back, the mail of OKCS was already there, that one immediately gives me spare. That was now, because I've worried a new cable on site, actually no longer necessary. So I politely asked to refund at OKCS. This was promised to me in a very short time and in parallel I have had the refund Mail Amazon in the Inbox specialist. I must say that I really compels the already great respect, is as fast, uncomplicated, professional and customer-friendly acts in OKCS. This is more than pleasing. Many thanks again at this point.