The Microsoft arc touch mouse is a beautiful and great product.
I've received many compliments from people saying that they think that the mouse looks really 'sick' and nice. And they are all very amazed by how the mouse works as well.
The learning curve of the mouse is a bit of a problem for people who may find it hard to learn new things quickly. It took me around 2-3 days to get used to the mouse.
I'm currently using Window 8, and sometimes the mouse isn't detected. Especially after putting the system in sleep and waking it back up. If I want to use the mouse, I would have to restart my laptop or else the mouse will never get recognized.
I find the page-up and the page-down button on the center in very odd position. I am never able to use the page-up and page-down the first time I try to press it. And the scrolling function can be very unresponsive at times.
But beyond those points, when the mouse is working the mouse is great. This is the most portable mouse ever, and the USB receiver connects to the back of the mouse strongly, and I have yet to ever experience the receiver lost in my bag. When it's flat, I can slide it in my bag and it take little to no space in my bag.
I also really like the scrolling feedback from the mouse. Although it's flat, when you scroll up on the white bar, you get this *clicking* sound for scroll. That is a really nice feature, and it's not too loud that a even a quiet room is ok to scroll constantly.
I give this product 4-star, because of connectivity issues. But that may be the problem of Window 8, I'm not too sure. And the oddly designed page-up and page-down buttons. They may want to consider two buttons on the sides for that instead. Overall very satisfied with this product.