On the bottom of the controller is a headset input. You can plug in any headset with a 2.5mm jack (standard for cell phone headsets), but the input is form-fitted to accept the Xbox 360 Headset, which has built-in volume and mute buttons. Compared to the wireless controller, this model is slightly lighter and less bulky due to the absence of a battery pack at the back of the controller.
The performance of the Xbox 360 Controller on the console is phenomenal, with instantaneous response time. The controller syncs with the system much faster than the wireless controller, and the force feedback is a bit stronger. On the PC, the controller performs more than admirably. Once you download the software from Microsoft's official site, the controller will work with any controller-compatible game. As long as the game you're playing allows you to customize button usage (most do), the controller ranks among the best available for the PC. Games specifically designed to work with the controller can also make use of the headset input and the force feedback.
The Xbox 360 Controller is one of the best-designed and best-performing controllers on the market. If you're looking for faults, you might argue the controller lacks any startling new features--especially in comparison to the motion-based controllers for the upcoming Nintendo Wii and Sony PlayStation 3--which may hinder true game design innovations. And you might also say the controller's about $10 too expensive. Overpriced or not, however, it serves as a great third (or fourth) Xbox 360 controller and, when called upon, fills in nicely as a PC gaming controller.