PC gaming and console gaming have evolved separately along parallel lines. Some things bridge the gap, such as gamepads, but often these products are accepted by one 'camp' and all but refused by the other. Due to the nature of PCs (and their included original equipment), most PC gaming is accessible to mouse users, regardless of other possible input devices that can be used. The mouse and keyboard have been the mainstay of PC gaming for quite sometime. Gamepads, rampant on video game consoles (once again, original equipment...) have had 'force feedback' or 'vibration' features for some time now. But PC users couldn't get the same sort of stimulation from a keyboard or a mouse...
The Saitek Touch Force Optical incorporates 'TouchSense' Feedback from Immersion Technology to provide that tactile feedback so lacking in PC gaming. A benefit of having feedback on a mouse? You can also simulate 'textures' - the feedback is changed based on movement of the mouse, much like the vibrations of a piece of wood being dragged across gravel. The only difference is that in the case of the mouse, the vibration is being generated not at the surface that touches the ground, but in the middle of the mouse itself...