Overall impression: positive mixed at the beginning, in the end badly

Faithful companion of a programmer and his laptop, which is often the customer's premises, where it has already found the strangest "jobs".

The following points I find positive:
- The Darkfield Laser that works clean even on strange surfaces like leg or laptop bag.
- The ability to store the receiver inside the mouse
- The fact that there is a Unifying receiver that must share the mouse at home with a keyboard
- The quality appearance and the fact that also is still wertig processing.
- The (not disturbing me) a few exceptions very good ergonomics (see below)

Well, and here the reasons why there were no 5 points:
- To store the receiver inside the mouse, until the battery cover has to be opened. Since there are much better solutions.
- The screening of the scroll wheel is a little bit sluggish

And finally a few idiosyncrasies that does not interfere with myself (and I do not value it), but perhaps others are interested:
- The "Hyper-fast scrolling" by particularly smooth scroll wheel in my opinion is more of a gadget. On the one hand the wheel tends to be independent when you move the mouse very jerky, "verscrollt" on the other hand it is easy if you want to switch between the two modes or sideways to scroll.
- The 3rd mouse button had to be laid for it as a separate button behind the scroll wheel. For people with larger hands it can be reached so bad.

After I but the 3 button almost never used and even more work at the keyboard navigation, which are not negative points for me

Conclusion: can omit Beautiful part where you would 1-2 gadgets to make it so 1-2 euros cheaper.

Update after one year:

The times given for batteries are, well, very glossed over. In my experience, you need every 6 months a new set.
What is much worse: The left button now tends to double clicks, which I think is more often occurs. After what I have read on the internet seems to be the one "Logitech" to be -Krankheit which occurs relatively often. I had never experienced so far in my career, and was not concerned with all my Logitech mice it.

Too bad, but that does only one point less you can not give unfortunately