Wanting to avoid the wired clutter on my desktop, I upgraded to a Wireless LAN and also bought this mouse after reading the product specs.There are two significant problems when using with a laptop (mine is a Compaq Evo N1050v running WXP-Pro with all the latest patches).
a) The wireless transmitter is the size of a regular mouse and comes with a fairly long cable. You end up carrying the equivalent of a regular wired mouse and the wireless one!
b) The new features like scrolling sideways and accelerated scrolling do not work if your notebook has a Synaptics touchpad. I tried uninstalling the Syn drivers, disabling it in the BIOS, connecting over the USB / PS2 ports - everything short of flattening the box and reinstalling XP. No progress.
I subsequently installed the mouse on my desktop. It works fine and I was up and running in a few minutes. The sideways scrolling and accelerated scrolling are divine, especially if you work on multi-column spreadsheets or long reports. Alt-tabbing with the wheel-click makes it possible to work on multiple spreadsheets with one hand!! I was a bit apprehensive about the "click-less scroll wheel", but I now find the clicking scroll wheel of earlier mice slows me down.
This mouse feels absolutely great to hold and wish I could get it working on my laptop...
Feature wise, this deserves a rating of 5. But because Microsoft do not publish anywhere the size of the wireless transmitter, and it couldn't work with Synaptics drivers on the same machine, I have reduced it to 3. This information was not available in the product literature that I picked off various websites...