The 'ability' to be joined by characters is quite huge. It's a pretty effective (and scary) delivery system for an oldblood or scar-veteran. Once the character goes on his own adventure, and if you still have SCOR standing, they can go for a flank or hunt some light units. Even with just 2 models, they're still a threat to skirmishers and the like.
I like them very much, because I never have had any cavalry playing dwarves. So I like the speed and maneuverability they give my army. They are not a cavalry unit you can send into the front of an infantry unit and expect to come out on top.
I use them as a flank buster without character or, as said, as a delivery system when joined. A SCOR and a unit of skink skirmishers are pretty capable of holding/taking/not giving up a flank.
The Hunted