To be honest, they're an incredible efficient company now and if you contrast that with their reputation for building unreliable junk it's a pretty impressive evolution.
Most of what they clone hasn't been in production in decades. Often the companies have changed hands or gone out of business. The clones are orders of magnitude cheaper than the real deal used and generally have more functionality (see: the new Poly D). In short, there's demand but not much realistic supply.
It's possible Devil Fish has some patentable novel concepts but the skeptic in me says probably not. He's trying to operate in a different business space than behringer is. That seems to be the dispute (beyond the very fair critique of the word murder and the color)