-Very comfortable shape -Connects very easily, even to Macs -Switches between computers almost instantly -Drivers allow huge amounts of customization -2 side buttons (+1 for connection switching, no macro), 1 side button hidden at the bottom of the thumb rest, scroll wheel left/right/center, gives tons of macro options without making the mouse look full of buttons -Smooth/clicky scroll toggle -Soft touch material on the body is holding up and doesn't get filthy easily -Confident button detent

-May be on the small side for very big hands, but probably still fine -I don't believe the drivers allow custom button combo macros, but still have a huge list of actions available for any button, and can even be program specific -White base may not stay white in especially dirty environments, but mine is still clean -At $80 regular price, if you don't really need the ability to switch between multiple devices all the time, there are better mice at the same price point.

I got this mouse on sale for half price about a month ago and it feels like a steal, super happy with my purchase. Having used the mouse, and knowing how useful the connection switching feature is, I would happily pay full price. If you don't need connection switching it's harder to justify the cost, but still worthwhile in my opinion. Keep in mind this is a productivity oriented mouse, though I still use it for light gaming. Logitech has come a long way in the last 5 years since I bought my one last.