Theyre lovely until the ewes give birth, look at the lamb like its an alien landing, give it the V finger and walk off....:-DDD at least thats what the farmers round here say (who had Blackies man and boy for decades).
However they are very tough and very beautiful! One neighbour still has a flock for breeding scotch mules, (he does the standard approach of putting a blue faced leicester ram on them to make scotch mules who are then mated with texel ('terminal sire') to produce the end product of a very meaty lamb for selling) and up on the hills where I hack they are common as they are one of the few breeds that thrive.