Summary: I have gone through 3 of these and they have all had the same problems. A short in the cord right next to the mouse, left clicks not registering and the mouse wheel stops working. It works fine for about a year but then starts to go bad.
Summary: OK gaming mouse, however I have been through 2 of them in 1 year. They are not well made and wear out VERY quickly. Support is good, and they do send you a new mouse, however it takes a long time to get it along with a LONG phone call with support with persons which English is not their primary...
Summary: People having same issue with this particular mouse and its cable. Do not buy it. In my particular case, after 3-4 months it died. Where the cable meets the mouse its a very weak spot that with a little tug and eventual bending happening in normal usage can turn your expensive mouse to nothing.
Summary: I put a lot of faith into Logitech because of their durable $20 mice that I have gotten so much good use out of. I decided to spring for this gaming mouse and regret it. First, my mouse sensitivity kept changing and I would have to go into the software to readjust it.
Summary: This was not an inexpensive Mouse.. We were shocked that the USB wires where they enter the mouse had broken in about 2 weeks. The mouse was intermittent in use. If you wiggled the USB cable near the mouse you could see the mouse work and stop. I think Logitech used too thin a cable .
Summary: This model and probably other models of Logitech mice have this major issue with its wheel. Eventually it will stop working and even worse malfunction and seems like Logitech offers no solution to this matter. I should've googled about this mouse before I purchase.
Good ergonomics. Bad design particularly the cable.
Chris Miller, Amazon
2 September 2013
Summary: Logitech mice have always been my fallback mouse. I've tried other brands and haven't had the same experience with them as I have with Logitech. Until now. This mouse has died on me in less than one year. It started disconnecting. All the time.
Summary: This is my second mouse from logitech with the same issue; random disconnects. I can be hard on a mouse. I have a home office where I do graphic design all day and then at night I game a few nights a week. I usually get a year or two from a mouse and I think that's reasonable.