There are plenty of folks here who have DDR dogs as active (active being the key word) family pets. It all depends on the dog, so find a breeder who knows their dogs well enough to match you with a pup with a temperament that meshes with your lifestyle.
May I ask why DDR specifically? Most people, unless they're deeply involved with the breed/sport/etc wouldn't be able to tell a DDR apart from another working line by temperament and probably not by looks, either. It's become something of a "buzzword" these days... don't let it limit you in your search for a breeder. Use it as a guide if you're really set on it, sure, but don't count someone out who produces great, stable dogs just because they're not the lines you think you want.