Pops, one of the vets I worked with breeds Running Walkers. Well, her husband does anyway. Their dogs are AMAZING! I'd never heard of them until she offered me two to use as bay dogs. They refused to stay on the trail of small game, and instead kept veering every time they smelled a hog. In that program, that gets you culled (and no, I don't mean spay/neutered and "adopted" out).
They were 10 months old when I got them, and I handed them over to a close hunting friend. He trained them for 2 months, and they took to tracking/baying hogs and working with his ABs and Catahoula Bulldogs very well. I've run my APBT, Tar Baby, with them as well, and all get along just fine. That pair is now 7 years old, and they're still going strong!
ETA: I wanted to say that these 2 dogs are sweet dogs, but I wouldn't say they are affectionate or goofy or whatnot. They're actually quite, ummm, self-contained? They are pretty intense, and they live to hunt. When they're not hunting, they prefer to be together and just do their thing. They're not into playing with kids or even snuggling in your bed. They like attention, but don't go nuts trying to get it. But what they want most of all is to get their radio collars on and be turned loose in the woods. lol