I decided to get two of the same mouse because I wanted one for work and one for home. On the one that I used more frequently — at work, the scrolling stopped working after ten months — you twist in one way, and immediately after that it works in the other, which is why you twitch in place. The scrolling mechanism broke after ten months. I believe everything is working well on the mouse at home; it was probably just a matter of bad luck. I'll go to the store and exchange it for the same model, and I did exactly that. A month later, the scrolling on a home mouse breaks in the same way, but the warranty from the store has already expired; nonetheless, there is a manufacturer's warranty that is good for two years, and I'll eventually get around to replacing it. You have to go without a regular mouse for a period of one month once a year in order to make the switch to a fresh pair of mice. The question is directed toward Logitech: when do you plan to begin producing normal mice that do not have broken scrolling or multiple clicks? I considered switching to a different mouse, but as I read through the comments, I noticed that all of your mice have the same issues: double-clicking and scrolling. I'm not interested in mice from any other manufacturers! Build me a mouse with buttons that can't be broken and scrolling that works like it did in the past. Please!