From the Logitech website:
Introducing ERGO K860, a split ergonomic keyboard designed for better posture, less strain, and more support.
You’ll type more naturally with a curved, split keyframe that improves typing posture. The sloping form reduces muscle strain on your wrists and forearms – keeping your hands and shoulders relaxed.
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Pros
Pro Full-size keyboard
Heavily keyboard-addicted touch typists will like that it has a full-size layout but is still very compact.
Pro Front-located feet
You can lift the keyboard at the front to match your natural arm position instead of the common feet at back of the keyboard.
Pro Cross-platform key labels
Instead of printing a Windows logo on the key caps, they labeled the keys with PC and mac commands. This works also well for Linux users.
Pro Multiple device connections
You can connect the keyboard to up to three devices. For example, your Android Phone, iPhone and your computer and easily switch between the profiles.
Pro Media Keys
Pro: it has media keys
Con: you have to decide between media and F-keys or press the fn-key.
Pro Dedicated calculator key
Pro Dedicated lock key
In the top right corner, it has a lock key, so you don't have to press win+L to lock your screen at the office.
Pro Feels very solid
There is no slipping on the desk and is has a pleasant durable overall feeling when typing or carrying around.
Pro Looks damn beautiful
It has a very futuristic and minimalistic style with the dark-gray body and its rounded corners.
Pro Very quiet, top option for office environment
Pro Common layout
With this keyboard, it's easy to switch between ergonomic and non-ergonomic keyboards.
Cons
Con No backlight
To save battery life, there is no backlighting.
Con Bluetooth only, no cable
You can not wake your computer up with the keyboard anymore and have to push the power button, because there is no Bluetooth connection while the computer is suspended.