Almost everyone that's ever flown a Firefly and not died will tell you it's a safe airplane that "always recovers" but there are a bunch of dead Firefly pilots that would disagree if given the chance.
Look at its safety record. Read the "UK Fatal Stall or Spin Accident Summary (1980-2008) report" and see how they singled out the Firefly due to its spin-crash record. Even a test pilot instructor was killed in one. The Firefly is right there with the knife-edge Pitts Special in mishap rate and should never be considered "safe".
a little bit of knowledge....
whilst the data is what it is how is it that the aircraft is used by new/novice/inexperienced aerobatic pilots without incident?