I bought this keyboard a few months ago as a fan of Microsoft keyboards. I emphasize this because Logitech, although a very good company, may not accomodate Microsoft users very much due to small differences in keyboard layout.
For the time it works properly enough (although at the beginning the mouse had connectivity issues and kept on acting up, to the point that I was avoiding it and used a wired mouse instead, especially when precision was required).
I also had some difficulty adjusting to the keyboard, partly because I extensively use the CTRL+C and CTRL+V shortcuts for copy and paste. Since the size of the left Shift key is larger than in other keyboards, I kept hitting x instead of c, and c instead of v, resulting to totaly different actions.
Another major drawback is the use of the Function key to gain access to special keyboard functions. This key (switch to be precise, which makes the situation even more difficult) is remote, located in the upper right corner of the keyboard.
As for the quality, although it appears sturdy and well-built, it is also heavier and I'm not sure if it can withstand drops as well as a regular keyboard, unless for you the drops of a wireless keyboard are not at all unlikely.
The absence of indicator lights for Caps Lock and Num Lock is not practical, but I imagine it serves to save battery.
Finally, not to mention only the negatives, the wrist support base integrated into the keyboard is very good and practical (made of synthetic material like leather to avoid getting dirty). Also, the ergonomics of the curved key layout is satisfactory.
I think I would prefer to have bought the Microsoft Wireless Desktop 900 since objectively there are no significant differences to justify the price difference of about €20.
UPDATE APRIL 2021
The mouse has followed a declining trend over time, resulting in the left button not functioning correctly 25% of the time it is pressed. Of course, it has been 3 years of (not excessively systematic) use. Cleaning did not help.