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I was bought this keyboard for Christmas and assured it is Microsoft's newest and best keyboard and I have seen nothing to make me doubt that.
The keyboard is black and shiny with mat keys and white underneath, it is smaller than most keyboards I have experienced before and far less bulky. As you may have guessed from the name it is in an arc shape and I think it is quite feminine and stylish.
The wireless receiver is very small, I think the smallest I have come across and about half the size on the one for my wireless mouse. This is a little worrying as it would be easy to lose, but there is a magnetic cove in the back of the keyboard you can put it in if travelling and the rest of the time it is in the USB slot on the computer.
The reception is very good and I'm told would still work from the bottom of the garden, I haven't had any need to try that but it works everywhere in my room.
No software was needed, as soon as the receiver was plugged into the computer it was ready to go.
It comes with a protective case for transporting the keyboard, I find this comes in handy if I wish to use it with my laptop. (The laptop keyboard isn't as good)
The keyboard uses two AAA batteries which last for ages, I tend to forget to turn the keyboard power off but it uses very little power anyway so it isn't a problem.
Fantastic looking and fantastic working I would recommend to everyone, I love it!