This is an update to Logitech's Dual Action controller. They've added XBox 360 gamepad support for a lot of newer games that have been designed to immediately work with the 360 gamepad.
Previously you had to disable gamepad in the game's options menu's and use Logitech's profiling software to map the gamepad's keys to mouse and keyboard so this will definitely save a step.
I've tried over three hundred PC games and there were only about three that I could not get mapped properly to the Dual Action (Undergarden, Deus Ex Invisible Wars & Hammer Fight). Logitech is thee best gamepad and best computer component manufacturer.