Microsoft Wireless Optical Desktop 3000 Keyboard and Mouse (65W-00001)

I've used many Microsoft-brand keyboards and mice over the years, and this one is easily the worst. I'm the IT director of my company, and we just deployed about two dozen of these on new computers. The majority of the units have been problematic, with the most common issue being extremely poor mouse reception even with new batteries and short ranges involved. The receiver and mouse just don't seem to go together and function more like infrared than RF devices (i.e., direct line of sight). One user was so frustrated that he went back to his previous old and crusty mouse. Other problems experienced less frequently have been keyboard reception problems and certain keyboard keys not working. The keyboard layout itself is also a bit non-standard and takes some getting used to. The key travel is kind of short, sort of like a laptop keyboard. Major thumbs down on this product.