My friends mom has one. Jake, he is 13 now, Ive known him since he was 2 or 3. But is the sweetest little guy. He does bark, at the door and such, like a normal dog though. Seems welle nough trained for what they want in a family dog (sit, stay, walks nice on leash, doesnt take off running ect). He can have a "temper" and get growly. But its probably more to do with his breeding, which is BYB. But otherwise I think he is a pretty good little guy.
I have met tons others working in the grooming shop. Most have pretty good temperments fromw hat i can see. But being in a grooming shop is different then meeting on the street, less high stress area.