It looks funky, but the Logitech G602 is the most comfortable mouse I've ever used. It has finally replaced my venerable MX518 that has lasted for the better part five years. It's too bad Logitech's software is terrible. It worked fine in Mountain Lion but won't detect the mouse at all in Mavericks. Fortunately I have a license for SteerMouse from back in the day, the latest version of which is compatible with 10.9 and the G602. Logitech's Windows software is just as buggy, too, especially in Windows 8.1. Both Mavericks and 8.1 have been out for well over a month, and Logitech has released nothing in the way of updates to address the myriad of issues plaguing its software in both operating systems. It's a good thing the hardware is so comfortable, and I can at least work around the drivers with 3rd-party software.