I have a puppy from Olympia's last breeding of Bara and Java (a Kirschental dog). I've also been the kennel on several occasions and met Bara, Java, and a bunch of their other dogs. First, a little about myself. I've owned a couple of GSD's before my current puppy and put a BH on my last dog. So I have some experience owning and training dogs, but I'm not an expert.
My current puppy, is one of two males produced by the last breeding of Bara and Java. He is currently almost 8 months old. On the positive side, he has a super temperament. He has been exposed to a ton of dogs and a ton of people and has always been friendly. He is pretty confident and responds well to new situations.
He has a ton of energy, and right now has a tough time settling down in the house even though he gets a lot of exercise every day (but he's still a puppy). He has medium ball drive. He is intelligent and picks things up pretty quickly.
Housebreaking really only took a couple of days.
So far he has not been showing any signs of dominance. He doesn't guard food or toys. He has moderate food drive.
Obedience training is somewhat challenging because he does not have great concentration and getting him to focus exclusively on me is a challenge. He can be distracted fairly easily. I have seen other Olympia dogs and while they do well in obedience, I don't think they have the focus or drive of some of the working lines. So if you were seriously into competitive obedience of schutzhund, you'd probably do better looking at a working line dog.
My one concern right now is that my puppy has always seemed to be a little loose in the hips and has a somewhat ungainly gate. However, he is still a puppy and I've not had him x-rayed so its too early to tell if his hips will be a problem. But it is something I worry about a little.
I've also met Bara, who I think is the stud dog in the breeding you're interested in. He is a gorgeous dog and has a very calm temperament and solid nerves. I also went to an open house Olympia had a couple of months ago and was able to meet a ton of their dogs from various breedings. I came away very impressed. All the dogs seemed to have pretty solid temperaments and were good around people and other dogs. All of the owners seemed to be very happy with their dogs.
Hope this helps. If you have any questions please feel free to ask on this forum or shoot me an e-mail.