Not a speed burner, but has good short-range quickness and good vision which allow him to burst through holes and play faster than he times. My biggest concern is that he doesn't seem to gain much yardage after the hit, often going down on first contact; maybe it has to do with his narrow base because he almost looks like a bulked-up WR (thin and wiry for an RB).
I'll have to go back and watch some 'Bama games to get a better sense of how he plays.