The Defy is a stable-overstable high speed distance driver.
The Defy is straight with a nice bite of overstability at the end, and is best described as a heavily seasoned MVP Photon or a longer Axiom Crave. Like the Crave the Defy exhibits remarkable resistance to turnover even at high power. Players seeking a long straight power driver will appreciate the line-locking tendencies of the Defy, and throwers not fully powering the Defy will still get a highly useable long overstable disc.
The defining characteristic of the Defy is its resistance to turn while flying straight.
High power throwers will get a line-locking flight with turnover resistance and a fairly straight finish.
Average power throwers will find the Defy turnover and headwind resistant while still having a manageable stability for maximum distance.