Will it remove swirls?
Yes, of course, assuming the right polish combination and polishing techniques on soft and medium paints, but if you need more cut consider Fibre Scyther (DA) or Slim Reaper (rotary).
Is it suitable for DA machines as well as rotaries?
Yes, Shark Fin pads are ideal for DA polishers and rotaries. All machines that have the correct style and size backing plates, in fact.
Why the fin design to the pad face?
Fin pads tend to run cooler in operation, allow a better spread of polish across the pad face and even prevent polish splatter or 'sling'. They can sometimes feel a bit more consistent in use and allow for a more forgiving polishing angle (between pad face and paint surface) than flat pads. Like the popular waffle pad design, but just a bit more extreme in execution. We think you'll like it.