And very important, because I did not find this information first here in the reviews: There is no USB dongle or in the mouse, you have to plug in the laptop (as with many other Bluetooth models), may instead be connect the mouse directly to the ThinkPad by BT - without additional hardware. But that also means that if your notebook has built no Bluetooth, you no longer comes with the mouse, there is no dongle in. But for me a clear advantage!
The mouse itself is really small (not a normal mouse size), still can be but also with my big hands men good use (see my photo for size estimation)
The weight with the included (!) Batteries is very pleasant (not too light, not too heavy), and the whole design looks solid and well-quality than the corresponding mouse cables through the same weight size (I've also here).
In short, for my ThinkPad the perfect Bluetooth mouse. I was skeptical at first (based on experience of previous BT mice), but in my work the interplay perfectly.
If you do not move the mouse for a while, it is obviously in some sort of power-saving mode, which can be seen from the fact that is not transferred in the first movement about the first half centimeter mouse movement, but that does not bother, and gives me hope, keeping the batteries actually last.
The mouse has a solid on-off switch, which I think is also good.
The accuracy and resolution of the mouse is very good, it shows immediately (had the same sensitivity runterregeln).
All in all, a pleasant surprise! :-)
The only drawback is in certain scenarios, the small size of the mouse, but for mobile scenarios, this in turn is beneficial. But for the desktop alongside the Ultra Dock I look for additional still greater ThinkPad Bluetooth mouse (like advice as a comment!).
For further questions please ask!
[Edit on 13/05/2015] I have now deducted a star because but in practice now and then cancels the signal and you then either off the mouse and must turn or equal raus all ThinkPad and must go down. I do not know why that is exactly, so if the ThinkPad or the mouse. That does not matter, since it also deals with the interaction of the products. And virtually nervous these crashes but already.
