Holy crap I love this thing. I got it from PC world when it first came out, it is available on Amazon here.
Its super smooth, like a pebble under your hand. The mouse button is sort of on the underside, and it has a right and left click when you press where the buttons should be. You scroll by moving your finger over the mouse like you would a scroll wheel, its touch sensitive. It connects via blue tooth and works with every PC and Android device I have tried it with. Its ultra portable and fits in the little pockets in laptop & tablet bags. You can pair it with 2 different devices, it lasts months of a single charge and quite frankly, for a mouse, it looks quite sexy.
The only downsides I could say is that its buttons make loud clicks and the USB charger point is on the bottom so you cannot charge it and use it.
Neither of those are downsides. Unless you live with someone OCD about silence, they may kill you about the clicks. Being killed is definitely a downside.