Also, their web site indicates either not an English speaking native (understandable) or just sloppy and careless (due to many errors in the text (not a very good sign).
Have you read their LOOONG Contract? Seems to me to be VERY onesided. I think i would want a lawyer to review it and explain what it really says. In one place it almost seems that they can put the blame on you the buyer for any HD problems and you are out of luck! In other place they say they might replace your puppy with another one if that develops (Yea, most of us would do that!).
Also, NO guarantee at all on temperament, yet earlier in their text they make a HUGE point of pointing out that they only deal with imported dogs (implying if not stating that they do this to insure good solid temperament, even quoting Von Stephaniz!!!!!!!!!!!!!!
Very conflicting stuff - I think i would not want to do business with this place (maybe if you have met them in person you have a very different opinion (and that is very possibel of course) but unless you have met them in person and liked them and also met the parents and other dogs, I would find another breeder (contact some of the working line breeders on this forum, talk with them and get personal references/referrals from them and maybe even visit some of them).
Just some thoughts - since you asked.
Good luck with your search!