I ordered a second copy because I believe it is a model that in "end of life". I love it because you can program the roulette that "tilts" from left to right for different task (using the "Logitech Control Center 'software) and this is ingeniously practical (I use to increase or decrease the volume, but you can choose many other uses ...). Note that I'm on a Mac and mouse at Mac are absolutely crap for my taste, which is paradoxical given the quality of Apple ordis, but hey ......
