the 83 and 92 mm fly's are simply awesome. it IS hard to find a home for the 92's-- so few boards will work without insane amounts of risers or huge cutouts....
the 74's smoke the flashbacks, speedwise (my big ol' ditchboard with the 74's is so freakin fast it scares most of the people who ride it); but the fly's don't have too much urethane wrapped around that hard core, so they can be a little more "techy" in terms of what you can roll over etc...
sorry i am the guest. I never get asked for my name so i have to log in manualy. i guess i was just lazy that time. i didn't know it would cause so much comotion