Rotary core makes my "Core Hall of Fame," along with Storm's FE2, RAD and RAD+ cores, the Lane #1 Diamond (the version from the H20 series) and that thing Mo Pinel designed for the AMF XS series of balls, whatever it was called.
My issue with the Rotary has always been coverstock matchup. When it's bad (for me), it's bad. But when it works, it works.
Jess