
Originally Posted by
OceanicLanturn
Well since stuff such as Sand Attack or Mud Slap or Leaf Tornado are barely used competitively, normal priority moves are still better. So unless Sand Attack is going to be a new fashion trend, I'd say Heat Sprint and friends wouldn't get much usage when other priority moves are available. However, it'd be an interesting option for pokemon that don't get normal priority moves.
Slash Storm is Psychic type, so it shouldn't be compared to Aura Sphere. It's more of an in-game move because, like I said, Sand Attack isn't running around freely competitively.