i just learned them new years day. i knew i could do them for a while, just never really got the balls up to try them.
i got it around my first try and everyone after that, but it took me 4 tries to dial the rotation.
ive only done them on sketchy little jumps too, and im thinking about trying them in the park once we get snow again (damn january thaws), the only thing i can really think of as a suggestion on legit jumps is make sure you have your speed dialed for it... over rotation a backflip can be muchh worse than over rotating a 3.