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I used to have a 72" Starfish. I now have two 52" Starfish (one with wings) and a 32" Starfish as well as a lot of regular Larson soffboxes.
I would say the Starfish with wings can be made to do about anything in a studio, although I use my Larson 4x6 much more as a main light. Without question though, the Fish are great for high key.
As for how to use a Fish, that's going to be a trial and error sort of thing. If you are talking portraits, I'd start with it almost perpendicular to the subject and then test it as you turn it into the subject. Since you have two, I'd then put one in back of camera, on the opposite side as the other one and use it for fill, just remember it will throw light all over the place, including the background, which might be good or not.