dont think he works is stock any more, were good dogs. Rather by from working sire+ dam, then you know what they will do now, not 10-15 years ago.!!
I really don't think you need to worry about the working ability of the dogs Dave's breeds. It's easy to knock other people but there are dogs from his breeding killing all sorts of game on at least four continents. I have never bought a dog from him, but I know Dave and the blood lines of our dogs are connected and if you go to his house he will show you letters and testimonials from an awful lot of people who have bought pups from him