Summary: Logitech was kind enough to send me another mouse of the same model as a replacement, but the replacement died (not response at all in any USB port on any computer) in less than a month. I just got off the phone with Logitech and then are forwarding instructions on how to get a refund (they offered another replacement, but I gracefully declined). I like the design, but apparently the quality is lacking.
Pros: Smooth and comfortable in your hand, nice to the touch, simple. Hyper scrolling is crazy good! Loved it.
Cons: Started acting up about a year after use. The middle scroll button would start clicking and closing tabs randomly, so I stopped using it. Apparently a common issue for other users? If it hadn't died on me so quick I would've given many more stars
Cons: Erratic behavior in win-7 and linux when plugged into Starview 4-port dual dvi kvm. Win driver is defined as hid-driver. Plugging mouse directly into win-7 machine results in correct driver install, but reverts back to hid as soon as you plug back in KVM. Default OS drivers do not work well with this mouse thru KVM. Very difficult if not impossible to use.
Pros: Very comfortable. The extra side buttons are quite useful, and the tilt wheel makes it easy to scroll horizontally as well as vertically.
Cons: I don't abuse these, but I keep going through about one a year. Usually it starts going out right about the time the warranty is up. Cause of problems is typically either it stops tracking, or the buttons start responding erratically (sometimes multiple clicks with one, sometimes none). With that low of reliability, I don't think I'll continue buying these anymore.
Pros: Very comfortable. Perfect number and placement of buttons for basic office usage. It's an excellent lower-end, basic mouse... when it works.
Cons: This mouse worked great and would have been 5 stars until it developed a double-click issue about 15 months after I bought it. Now it's basically unusable. Every time I single click it reports a double click to the computer. Or, when I click and drag (such as dragging a file to another folder), it "loses" the click and drops the file before I let go of the mouse button.
Summary: This is a great mouse, with one major problem: the middle click. The mouse wheel requires too much force to register a click, a specific angle from which you must push it down, and often makes the click sound without registering the actual click. For me, it takes an average of 3 middle clicks for it to actually register. I got a replacement which had the same problem, leaving me to conclude that this is a design flaw of this model.
Excerpt: Was going to replace my Logitech G5 with this mouse because of the scroll wheel that was advertised to preform really well. It only took a few minutes to realize how poor this mouse felt compared to my G5. The buttons especially felt very cheap and while the scroll wheel was easier to scroll, it still didn't feel solid. The mouse also doesn't move as smoothly on a mouse pad as my G5.
Summary: Am I the only right-handed person who uses a mouse with the left hand? This is a very good mouse but I wish they made a abidextrous version. Using it with my right hand was uncomfortable after awhile and trying to use left hand can become painful. I love the long cord, and the features are awsome. The programmable scroll wheel is smooth as butter but this is not a comfortable mouse for me after using it awhile. So I am shopping for a replacement.
Summary: I am on my third mouse. the Lasers are either not powerful enough or poor qualuity. They need to be physically cleaned about every 15 minutes of use with a Q-Tip or the response becomes very slow and eventually after 30 minutes or so non responsive. The cursor movement out of the box or within about a week becomes 'jittery.