An extended magazine release lets your thumb reach the button without shifting your firing grip -- which keeps your hand in position through the release and ready to receive the incoming magazine. On the 92, where reaching the factory button requires a small grip adjustment for some hand sizes, an extended release removes that adjustment from the reload chain. On a DA/SA gun where grip consistency matters for every shot, keeping the hand consistent through the reload matters too.
Confirm compatibility on the individual product page before ordering.