For two weeks I had the mouse now in use, to the consistently positive expressions for MX700 there is nothing here to add, except, of course, that the MX900 is connected via Bluetooth with the computer. So it has a longer range and traveling ranges and a small Bluetooth-Stick to connect the mouse, for example, the PowerBook (or PC Notebook). The charging station can stay at home. To the small blemish on MacOSX: On the packaging of the mouse is only certified to work with a PC; she also works on MacOSX (10.2 / 10.3), without anything needs to be installed, either on the internal Bluetooth adapter, a Bluetooth stick or just on the charging station, which is a hub simultaneously. Unfortunately, only operate the left and right buttons, the scroll wheel and the scroll wheel button, the 5 additional keys can not be programmed as an appropriate software from Logitech for OSX does not exist. However, the three functioning buttons also work properly on Mac, quickly and accurately. About the System Settings allows scrolling speed, click speed, ..., the scroll wheel is detected. The batteries last for continuous use 3-4 days, then in a very short time (1-2 hrs.) Fully recharged.