I don't know where to start. I am new to spirit keeping and was very reluctant. But I must say protection and loyalty is an understatement. The things they have done including manifestations are unreal.
Advantages: They have your back in every situation and do not play.
Disadvantages: You have to watch them closely because they will defend to almost no end. I don't think actual physical harm is something they do, but the bad luck and misfortune they send to your offenders is crazy.