I have one

Is there anything specific you want to know about them? What Discodobe said is pretty accurate. They arevery athletic, high energy dogs that love to get into trouble. They are not "aloof" with strangers though, aloof is uncaring. PyrSheps are distrustful of strangers. Or so their standard says. I have met PyrSheps with all range of temperaments from distrustful to friendly to aloof to reactive to very shy to extremely nervous. Mine is pretty friendly for the most part. But yes, they are almost all extremely attached to their people. At 3 months old, Savvy went over a 4' fence to get to me. He doesn't like being crated for long periods at all, doesn't like being left and is very competitive with other dogs for attention.
Socialization is extremely important because of their tendency to be distrustful and attached to only one person. By socialization, I don't mean going to puppy class once a week. I mean trying to have the puppy with you more often than not and exposing them to all sorts of different people, places and things but not forcing interaction if they are worried about something. I think drive building is important too, as it helps them focus on you and gives you a way to increase their confidence. Savvy comes to work with me every day and has since he was a puppy. He's gone to two training places fairly regularly since he was young plus dog shows, agility trials, family get togethers, spending the night at friend's houses, car trips to different towns to explore, the park, off leash walks, etc, etc, etc. I think PyrSheps really need an owner who is interested in being very involved with their dog.
Here's savvy working on some training...and playing:
http://youtu.be/Jtvi65jeMdU