Correction: the Firefly is rumoured to take a while to recover. It doesn't - if the correct recovery actions are taken it recovers immediately (within 2 turns) every time. I have spun Fireflies (T67M 260s) hundreds of times and never once had a problem with recovery, even after a 23-turn spin. Recovery will be delayed if the stick is moved forward before rotation stops having applied opposite rudder, as a high-rotational spin may develop, but I believe this is no different to e.g the Bulldog.