An excellent mouse from Logitech.I like this mouse so much I have two, one for the work laptop (Windows XP) and one for home use (Mac OS X).There are some minor quibbles, which I note below, but the VX Revolution gives a great value for the price (especially when Logitech has a rebate going.)Size.The first thing to note about this mouse is its size. It's marketed as a "notebook mouse", and physically a bit smaller than a full-size desktop mouse. It seems quite a bit bigger (relatively) than mini or travel mice aimed at laptop users. I'm a 6ft tall male, and this mouse is just on the cusp of being too small; any smaller and I wouldn't care for it. If there's any doubt, test drive one in the store first.Buttons.This mouse has the standard 5 buttons (left, right, wheel-click/middle plus the back and forward buttons on the left side), and a couple extras.Below the mouse wheel is the "Internet search button". By default (on Windows) this button finds the highlighted text in the active window and does a search on it in a browser. I don't find this useful in practice, and luckily you can remap the function of this (or any other) button. I usually keep it set to "Open Outlook".On the right side, on top, above the back/forward buttons is the zoom slider. This slide is, for me, the biggest negative. It feels rough and looks cheap, and the sliding action is nowhere smooth enough to feel right in an application. I would have preferred a set of 3 clickable buttons (Volume -/+/Mute) as on the MX 610, but you can't have everything. I keep the slider mapped to increase/decrease volume, and don't use it for zooming.Mouse Wheel.The "Hyperscrolling" feature of the mouse wheel is a combination of mouse wheel mechanics and driver software that let you crank the sensitivity way up. The wheel supports a base speed and an acceleration, so if you scroll a little you move a little, but if you scroll faster you move a lot faster. It takes some tweaking the settings to get to a comfortable level.Even better, there's a switch on the bottom of the mouse to change the wheel between free-scrolling and ratcheted operation. I prefer ratcheted, but the action in either mode is very nice, and never gummy.Drivers.On Windows I use the supplied SetPoint drivers, but I also install the 3rd part "UberOptions" package. UberOptions provides additional configuration files that allow you to map any mouse button to any SetPoint-supported function. (For whatever reason, out of the box SetPoint doesn't not allow certain functions to be applied to certain buttons.)On OS X the supplied drivers are adequate, but I prefer using the 3rd party "USB Overdrive" software. USB Overdrive lets you set the mouse speed and acceleration far above what the Logitech drivers (or basic Apple drivers) allow, and let you remap button functions as well.Misc.The USB receiver for this mouse is smaller than a memory stick, and fits in a slot in the base of the mouse when not in use. Inserting the receiver into the mouse turns off the mouse, which was a neat touch. A button on the bottom of the mouse ejects the receiver, and turns the mouse on as well. The reception is the best I've had yet with a wireless mouse, and I never have any dropped clicks (except when the battery is almost low.) The mouse runs on a single AA battery, and lasts weeks at a time, depending on usage.