I have a Pyro, and it revs up moderately far down the lane, and when it makes it's move is a hard arc to the pocket, with a ton of continuation. I've seen a Fired Up which is basically the same ball without particle, and that thing was WICKED off the break point, very angular. Then I've only seen one inverted Twin-V, the Spit Fire. It was a bit of a tamer piece, super rolly-like and picked up a lot sooner than either the Pyro or Fired Up I saw. So my guess is that bowler0821 is spot on and this Rapid Fire is going to be mostly if not all (especially since it's a polished piece) backend.