The MX is the top-of-the-line wireless mouse from Logitech.
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Pro Great ergonomic design
The MX is an full-sized, ergonomically designed mouse that is designed to fit the hands of those who prefer a palm grip.
Pro Works on any surface
The MX uses "darkfield" technology to allow it to work on glass, mirrored surfaces etc.
Pro Good battery life
Once fully charged the mouse lasts for several weeks of moderate use before requiring further charge. Users are notified through lights on the mouse itself, and systray notifications when the mouse is nearing the end of its charge (generally several days before).
Even after several years of use this appears to be the case.
The mouse uses one AA battery. A rechargeable NI-MH battery is included. The battery compartment is easily accessible, requiring no tools to assist.
Pro Logitech Unifying Receiver (Dongle)
The Logitech Unifying Receiver allows you to connect multiple (up to 6) devices through one single, small dongle. The dongle itself is made up mostly of the USB connector, meaning it's small and so stays out of the way, and is unlikely to be bent or broken if knocked.
Pro Flickable scroll wheel
Hitting a button behind the scroll wheel changes the scroll wheel from clicking up and down in a controlled manner to allowing you to flick it and quickly scroll through large portions of a document.
Pro Useful extra buttons
Three programmable buttons are easily accessed by your thumb.
In addition to the Zoom, Forward and Back buttons depicted, the thumb rest has a button for switching between applications, the mouse wheel may be held to allow drag navigation, and the mouse button may be tilted left or right for horizontal scrolling.
All of these buttons can be configured per application via the bundled SetPoint software.
Pro Works whilst charging
Though the mouse works wirelessly, it's recharged via USB. When recharging, the mouse continues to work .
NB: The mouse still communicates wirelessly, so requires one USB for the Logitech Dongle, and one for the charge cable.
The price is currently hovering around the $70 mark, being marginally over this price from a number of outlets, putting it at the maximum limit of this question's price range.
Con Occasional Fault
A commonly reported fault is that the mouse's main buttons occasionally cease to function, or double click when only a single click is intended.
However this is easily resolved by removing the batteries and pressing all of the buttons to allow the mouse's capacitors to discharge.