Those dogs are from west German show lines. Whereas in America, dogs have those horrible angulated hips, German show people are selecting heavily for exaggerated roaching. This is an interesting link showing the different body shapes and where they developed, as well as offshoots of the GSD breed.
http://www.shawlein.com/The_Standard/13_Breed_Type/Breed_Types.html
A copy of the German GSD breed standard.
http://www.kerschberger.com/GSDbreedstandard.htm
To my understanding, the roaching was developed because it gives the dogs extra power in vertical leaps. It also unbalances other aspects of their physique, but that is why there is so much variation in the breed. So many lines are used for so many different kinds of work.
Anyway, it looks like those folks have some nice west german dogs. I would check with the AKC and see if they are in good standing with that many litters being produced. I was checking out a borzoi breeder who produces a lot of litters, and it turns out that she was suspended from the AKC because of falsifying pedigrees. :yikes:
Personally, I would go with a breeder who produces less litters, with a focused goal for each pairing they do (i.e. we bred these two dogs to make puppies who have sound temperaments, great health, and strong drive for XXXXX dog sport). And then pick a puppy who was made specifically for what you want to use it for.
The ONLY really legitimate reason I can think for them making that many puppies, if their motivation isn't money, is if they are breeding and training dogs for law enforcement, service dog type positions. Within programs geared towards producing dogs of that type, you will often get only one or two pups in a litter with all of the correct and needed things to make a working dog, i.e. temperament is just right, drive is just right, physical stamina, etc. so you have to produce quite a few litters with lots of extras to fill the quota of police dogs. I don't know if that is what they are doing at all though. Something to check out.