I have for a sale a 6 month old Sidewinder mouse.
-Shape Designed for Handling
The unique shape and button positions are engineered for fast, comfortable, precise gaming action.
-On-the-Fly DPI Switching
Three buttons instantly switch between DPI 400, 800, and 2000 - or you can customize settings using special software.
-First-Ever LCD Display on a Mouse
DPI settings and macro recording icons are displayed on the mouse to reduce on-screen interference.
-Cable Anchor + Accessories Storage Box
Enjoy wired performance with the feel of wireless, easily adjust your cable configuration, and conveniently stow away your accessories.
-Quick Launch Button
One-touch takes you to Games Explorer in Windows Vista. Easily access your games on your PC.
-5 Programmable Main Buttons
Customize your main gaming buttons to your preference.
-Advanced Gaming Software
Buttons and switches can be assigned on the fly, you can program macros and profiles, and game settings can be customized for fast action.
-Engineered for Speed
RESOLUTION: 2000 dpi
IMAGE PROCESSING: 7080 frames per second
MAX ACCELERATION: 20 G
MAX SPEED: 45 inches per second
USB REPORTING: 500 Hz
GLIDE: 3 sets of different mouse feet (for glide preference)
BUTTONS (Left/Right): 9 million clicks
-Replaceable Mouse Feet
Choice of three different materials for glide preference.
-Wide Metal Scroll Wheel
Better feel and response with detent clicking action.
-Vertical Metal Side Buttons
The top/bottom design makes locating the side buttons easier and reduces the inadvertent actuation risk.
-Adjustable Mouse Weights
Select your preference of mouse weight with the included 4 weights, giving you the choice to adjust your mouse weight anywhere between 5 and 30 grams in 5 gram increments.
The lower of the two side buttons is a bit stiff but I haven't used the mouse in a few months so will probably loosen after use.
Comes with the weights holder, 30 grams of weights and 3 sets of feet.
Full details here http://www.microsoft.com/hardware/gaming/ProductDetails.aspx?pid=100