"Great starting point."3.5 starson by howl2z
Pros: Good feel to the trackpad.
Better interface for Windows 8 than a mouse.
Finally a Windows accessory that is close to Apple's Magic Trackpad
Cons: Software does not automatically update Logitech Setpoint to a version that handles the T650.
Price (but the marketplace is forcing it down to a more reasonable point).
Summary: Makes windows 8 'modern' user interface easier to tolerate, err, I mean navigate. It may even persuade me to work more from the Start screen instead of immediately going to the desktop.
Make sure your Logitech Setpoint software is up to date, as it did not automatically do so on my first connection and I could customize the responsiveness of the T650 until I updated Setpoint. I have yet to try an unify my keyboard with the single USB dongle, but will likely try that soon to free up one of the two USP ports currently dedicated to input devices.
It is certainly worth your purchase in the $70 to $75 range (or lower if you're lucky). I would not like it as much had I paid the $100 retail price when it was first released.