Working beardies have a harder temperament, which can be a good thing sometimes, as they are not so prone to nervousness or being highly strung as borders, but also can take a bit of handling, i.e you need to be the dominant pack leader, and keep on tops of them when young.
We tend to use beardie blood, or a mix or border/beardie in our running dogs, as we find that collie blood gives the bidability, natural knack for working cloven hoofed quarry, and good wind, feet, etc etc. But sometimes the border x's can be prone to nervousness, however, with the beardie blood they tend to be a bit more hard headed. Before the ban, seemed to have greater luck producing a fox dog out of beardie blood also.
I know that's quite off topic. . . . .