Summary: The distinguishing feature of this mouse is the heavy metallic flywheel for scrolling. You can set it to free rotation (without clicks) mode where it will scroll on like a gyroscope flywheel, or the old standard clicky mode.
Summary: I really like this mouse, it's an excellent device on so many levels, but it is NOT DURABLE as a portable device ought to be. On separate occasions, I have had two of these mice experience a SINGLE, minor drop (3') onto carpet, and they each no longer work.
Summary: I love the size of the mouse and the shape of it which makes it really comfortable to use. The free spinning wheel is great for scrolling through documents although it makes middle clicking a little difficult.
Excerpt: Look and feel are amazing, the USB receiver slots into the mouse turning it on and off which is cool. Choice of smooth or ratchet scroll wheel which is nice, scroll wheel tilts left and right as buttons, and pushes in as a button but I find this really hard to use.
Pros: Size, build, shape, number of controls, battery life
Excerpt: I've used both MS and Logitech mice before, very different feels, at home i had a basic MS optical mouse which i was fairly satisfied with, but ive also used a friend's Logitech MX518 which does feels even better.
Pros: Small, works well, very good looking, runs on only 1x AA battery
Cons: Not great for big hands, a bit too much lag for games, not terrible though
Summary: After reading all the reviews, i decided to buy this mouse. It lagged when i first started to use it, the worst part is, estimation time length for the battery is 120 days, but it dropped 5 days in just 1 DAY.....
Summary: Just received the mouse and tried to install the software 'SetPoint 4.0' on my laptop which has Windows 7. Got the message 'not compatible with this computer' and therefore had to go on logitech's website to get version 4.8. Otherwise can't really comment yet. Watch this space.
Summary: Great mouse if u never play games. Does everything u need and has a bit of quality along with it. Slightly smaller than a full size mouse so good if ur hands aren't very big. All the buttons feel good and hav positive clicks. Scroll wheel can b clicky or free wheeling.