Pros: #1 - Bluetooth + laser means no dongle to deal with and gaming-grade precision.

I picked this up to replace my non-laser optical mouse (also Logitech) and am very surprised at the precision this tracks on any flat surface I've thrown at it. There is no need to pack a mouse pad while traveling any more.

The one-piece, smooth top and mildly rubberized sides give a comfortable feel. The texture on the scroll wheel lets you scroll without putting pressure undue pressure on the wheel, which allows the wheel/middle click to not require an inordinate amount of pressure which causes motion in other mice. Similarly, the wheel left and right can usually be accomplished without motion of the mouse as well.

Cons: I have grown accustomed to the thumb buttons on my mice, and wish this had one.

The mouse goes to ready-mode after a minute or two of non-use. Causing it to "jump" a bit when you start moving it. A non-issue 99% of the time, but be aware that it will happen. I'd like an always on setting myself, since it does have a physical power switch.

Other Thoughts: Microsoft has an equivalent bluetooth laser mouse, but I've always been impressed with Logitech's quality and commitment to their products. I've been using them for almost 15 years now, and only replaced them in order to upgrade for new features (wheel, optical, laser, wireless, bluetooth) never for failure of the product.