Summary: My hands ache when I use a mouse like the wireless M325 laptop mouse as the arch forces my smaller hand to conform to the mouse. I found the M560 mouse comfortable for long term use. Larger or medium hands would probably prefer a slightly more angled arch, not one so contoured such as this one with a softer angle.
Summary: I have a medium "average" size hand. This mouse is too flat and very uncomfortable to use; it's definitely not a full size mouse; it's somewhere in between a compact travel device and a desktop mouse, as if the designers were trying to be both; that simply doesn't work, however. It can't be both big and small at the same time.
Summary: Desperate to get a full sized mouse for Windows 8 desktop, I purchased the M560 from Amazon. Sorry, Logitech, this is not a full sized mouse. That's not to say this isn't a good little compatible mouse that plays nice with Microsoft's new operating system because it does. It just doesn't suit my needs since I've already got a couple of mice for my Surface Pro.
Summary: I have been using this mouse non-stop now for about 9 months and I am still using the original batteries. What I really like about this mouse is the fact it works on nearly any surface as advertised. This is why I brought this mouse. I have a desk with a glass top and so my older mouse wasn't sensitive enough to work on that surface.
Summary: I was under the impression that the wheel could be changed into 'free-wheeling' mode but such is not the case. I have one that does and greatly enables scrolling whilst in this free-wheeling mode. Unfortunately, this one does NOT!! Pressing the accompanying button that is supposed to enable this either does not do it's job or I miss-understood the specs.