The Logitech trackball products are really recommended eyes closed. I use them for over 15 years and this new model is, as always, perfect ergonomics, which makes it very pleasant to use. Compared to previous models, I appreciated the small size of the wireless transmitter connected to the computer, it is really tiny, which amounted to nothing accuracy of the device. Two buttons were added, equivalent to the commands "next" and "previous" on the keyboard. Above all, there is now an "on-off" button under the trackball that allows serious battery savings! There is also a small LED that indicates the battery level (it will not stay lit all the time, only a few seconds to start the device). The black color gives it a sober and cozy side, but it's a lot less messy than the light gray of the old models. A good quality battery (a known brand) is provided, this is good. This model is also much cheaper than its predecessor, while maintaining the same level of quality.
For people who have never used a trackball, please, after a little time to adapt, you can not do without, it's much less tiring for the wrist than a conventional mouse and substantially more precise. In addition, flat surface not need to use it, an edge of a sofa or knee enough. In short, just happiness.
