They've made a lot of promises before and not delivered anything. If not a scam they're at least a BFL-style preorder scheme, taking orders before they even have a product design.
I think they have always been acted in good faith, unfortunately the number of board respins, as Ben said, have caused the delays as the original design was flawed but they are trying to recover from that as best they can. Unlike BFL they are not refusing to compensate those waiting given the emails sent out. They are offering compensation for late delivery again if I am not mistaken and that is a proactive result of their failure to deliver on time unlike BFL who are being dragged kicking to court and even then they refused to pay out what they owe people. nTek exposure is a lot smaller than BFL and given that you can email Ry directly and discuss their problems as a customer they are nothing like BFL.