Front hinged flippers like firestorm also have the advantage that they self right in one go, unlike the back hinged which can toss themselves maybe 5/6 times before they get back on their wheels.

We have just got out hands on some pneumatic bits for our 3rd machine and we can't decide: Axe or Flipper. An axe is harder to engineer and not as effective in terms of knock out as a flipper but looks so much better and produces more interesting fights; IMO.