I bought myself this for my birthday, as I was sick of the horrible colour of the HP one IT supplied me with. I also have an Apple Keyboard, although the white and grey shades don't match the mouse, they look more suited than the HP ones.
This is a really comfortable mouse, fits in my hand really well. The texture on the back part is really nice in the hand.
I find the inertia on the scroll zone really useful, much better then mauling a scroll wheel.
The only slightly annoying thing about the mouse is; in order to perform a middle click/scroll wheel click, you have to double tap on the scroll zone.
What I'm looking forward to seeing is the durability of this mouse. I use it on a desk, without a mouse pad, and I want to see how the front pad will hold up to the friction.
The main downside of this mouse, is the price. But it was for my birthday, and I deserve it. It also matches my Apple keyboard.