I'm aware that Printrbot designed and used the Printrboard before SD (check my signature).
But still back to my point I think a company that develops a board that has integrated driver is greedy or they just have no desire for customer support and self service.
So according to your statement, Printbot is NOT a reputable company, and have no desire to support the product. All because they developed a board with integrated drivers. You seriously need to get more informed. I can tell you from personal experience that isn't true.
As far CTC is concerned. I think it's a joke when people buy products directly from China (eBay, Alibaba, AliExpress, or whatever), thinking there's an enforceable warranty behind it. What a laugh !
Sure they "officially" offer it, but you must ship your defective item back before they ship you a replacement. The cost and logistics of shipping anything to China makes the warranty worthless and unenforceable. This is what we call "hiding behind an ocean".
To print or, 3D print, that is the question...
SD3 printer w/too many mods, Printrbot Simple Maker Ed., FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.