Excellent for € 26; adaptation required, some flaws to evaluate before purchase.

Under any OS but still under W8, this mouse brings very interesting features; otherwise it is beautiful and hygienic: We can over-estimate the importance of having a hand in contact with the tool that is easy to really clean. Apparently robust.

I do not know if I would have bought 50 or 60, list prices but at 20 and some, this is the deal of the century.

In terms of problems:

It takes time to form. The software is essential (it is very functional and stable) to fully enjoy the features and put them to his liking.

Internet browsing, with all these web pages blithely violate standards, including the new line, is much easier since I have this mouse. The presence of a keyboard is still needed for the single key that allows you to zoom with roulette. Incidentally, roulette is probably what this mouse emulates the better the result is far superior to a conventional roulette, even high-end mouse. This is even more true for horizontal scrolling, which is most of the time with catastrophic standard mouse and is splendid with this one.
Finally on roulette, the Windows default setting is 3 lines per scroll. This is too much for this mouse that can go very quickly and even accelerate: Turn this setting to a line and you probably will cease to be disappointed. This advice should be in red on the packaging ... Other settings are almost as important.

Having two contact points allows to use one or two fingers. I settled browsers for a finger to scroll and two fingers for history. Never used better than this configuration. Do not seek the pinch & zoom, there is none. As for me, even on a touchpad, I do not like to use it and it would probably be worse on the mouse. + Roulette is much more precise.

Like all touch devices, this one must constantly analyze the presence of a contact and interpret it ... with a margin of error. See your phone ... more contact there, plus there are errors. I find that Logitech has done a great job since even keeping constantly mouse in hand, mistakes are limited and bearable for the office. They will not, however, to the production work that requires reliability in editing operations using the GUI. The risk of data loss is significant and can lead to increased stress for the user.

The speed is similar, possibly even superior, to that of a traditional mouse. Only reliability is involved and causes some tension and decreased productivity. I will recommend to start learning to let go of the mouse whenever possible. immediate improvement. It is anyway good for health (carpal tunnel).

A problem seems serious enough, can be eliminatory, is that the click tends to stick. My mouse does not seem defective, since a lot of users report that problème.J'ai tried a cleanser "contacts" with lubricating abilities: no improvement. Leaving only the sandpaper and I do not think I want to try ... do not know if it will get worse but for lack of improvements, the mouse must be eliminated, which will be a disappointment, qualities by making also very attractive.

It is possible to replace the clicks by "Taps" as a "touchpad", which would remove bottlenecks and increase reliability. However, they must be very firm to the point of sometimes cause a click. It is all so difficult to detect when a "tap" is recorded. I dropped the "taps" for my part, except doubles, to switch to the desktop Start menu (Home W8).

The presence of a separate tap area (the lower 1/3 of the surface) generates some confusion since these areas are not clearly identifiable. An inactive area between the two, cutting the border frankly, probably useful.

Radio side, it's perfect: long range, good definition of the recorded movements, direct line not required. The receiver "Infinity" has provided ranks alongside the battery (I already had one) making the mobile hyper mouse. The included carrying case incites to carry around.

Consumption is ridiculous and the batteries must be recharged every few months. That alone justifies swinging his old wireless mouse: big environmental bonus.

In summary, an excellent product, apparently in its second generation, which requires a little effort to adapt. Unsuited to production operations, improving navigation on the internet and even if we change office habits a little. In conjunction with a keyboard Logitech K400, which includes a "touchpad" multipoint and offers its own version of W8 shortcuts, you get a complete entry kit, extremely powerful and functional, very oriented W8 and finally attractive and robust. All for the price of using devices and even low-end, since both are at bargain prices at Amazon right now. I recommend a good subject to consideration of your habits, including if your OS is not W8.