Excerpt: The size and shape of this mouse are very comfortable, and the color is nice, but the scroll wheel is extremely sensitive (which I found, after searching for solutions online, is due to the design of all of logitech's mice, specifically the spring that provides tension to the scroll wheel). You have to tense your hand to scroll accurately. <br /><br />It also performs poorly on shiny surfaces (no big surprise, I guess).
Summary: I purchased this mouse to replace the Microsoft Wireless Notebook 3000. Upon installation the mouse worked great! the movement and scrolling had a nice touch to it. However, problem arises on EVERY boot up of my laptop. I get the "USB Device not Recognized" message EVERY time i plug in the USB receiver. I either need to keep turning the mouse on/off and plugging/removing the receiver. If its really bad i have to reboot the entire laptop.
Summary: Cannot program the middle button to double click. Product support says to do that in windows, but there is no option to set a middle button in windows. The software that comes with the mouse has no option for double click, either.
Summary: Mouse would be fine as a portable mouse, but is a bit too small for desktop use. Scroll wheel needs harder detents, it's too easy to scroll accidentally. My biggest complaint is the hard force needed to click the scroll wheel, especially when combined with the soft detent, makes it very difficult to click on something without unwanted scrolling. Apparently Logitech doesn't actually test functionality of their products before releasing to the consumer.
Summary: I specifically choose a mouse that did not have indents on the wheel; I wanted a freewheeling mouse wheel. But this is so hyper that's it's nearly impossible to use accurately. Pages creep constantly if I keep ANY pressure on the wheel, and the pointer speeds are either too fast or too slow; I'm constantly missing my click point. This is a case of poor hardware and software conspiring against the user.
Summary: Compared to the Windows equivalent(which I purchased after this mouse quit working), I like the feel of the mouse better. My main problem with it is that the USB receiver quit working after I owned it for a week for no discernable reason. It would work for a whie if I had the unifying software open but after a while my computer wouldn't even recognize it as being plugged into any of the USB ports.