i have a viszla. she's a great dog. a little neurotic but was abused in her early days. she has been known to bolt out the front door for a run through the neighborhood but always comes home if we don't find her first. not always that good off leash at first but settles down when she burns off the energy. if she sees a stranger she runs right back. she's very protective but i'm not sure she'd actually bite someone.
she's got endless energy to go all day long but she's always been very tolerant with my son. he was two when we got her and he's 12 now so she's been through many stages with him.
also, the rep on this breed is that they have little odor, need infrequent baths, don't shed much, and don't bark a lot. if we get a dog, this is the breed i'm currently favoring...