Hardware Pacers has posted a review on the Microsoft Sidewinder X4
The Microsoft Sidewinder series gaming keyboards are top-of-the-line, highly functional gaming products that are excellent additions to any gamer's computer system. The These gaming keyboards are packed full of assignable keys that can be programmed with many different options or Macros. The Sidewinder X4 Keyboard features media keys and volume control, key backlighting with several settings, 6 Macro keys, and 3 key assignment profilesMicrosoft Sidewinder X4 Review