Excellent mouse with completely silent buttons and scroll wheel. Unfortunately, the side buttons and the left and right of the scroll wheel are not at all noiseless, but for using it in bed at night, the two silent buttons and the scroll wheel are sufficient. I would also prefer the scroll wheel to be stepless, but fortunately, the clicks it has are very smooth and close together.
The customization of the buttons from the Logitech program is fantastic, as you can change the buttons for each program separately (e.g., the side buttons can go back and forward in Chrome and undo/redo in Photoshop).
I had no problem with the connection, neither with the unifying receiver nor with Bluetooth. With the button below the scroll wheel (1/2), you can choose which connection you want to use, Bluetooth or radio signal (unifying receiver), and not only can you choose, but you can also control two devices with the press of a button (e.g., from the desktop with the unifying receiver, I press the button and switch to the laptop with Bluetooth or even to the mobile phone). The Logitech Flow program changes connections simply by moving the cursor to the edge of the screen.
As for durability, it's unbeatable. In the right hands, it becomes a real weapon, a true Nokia 3310 for the old timers.....!!!!! For about 3 years, it falls almost every day after I fall asleep and drop it under the bed. Sometimes my little one turns it into a toy car and crashes into other toy cars. The mouse seems to be a Highlander and has only a few scratches that are visible only in the light.
The accuracy and quality of scrolling are quite good, and I comfortably use it for graphic design when I'm not using the pen, and it's also friendly for light gaming.
The size fits my hand perfectly, and it sits comfortably on the mouse with hours of daily use. When I use it with my left hand, it's not comfortable at all, and I do not recommend it for left-handed people.
It takes one AA battery and easily lasts for 1 year with heavy use, and after the low battery indication, it has at least 1 month before it completely runs out. Also, the battery compartment can hold the receiver so that it doesn't get lost when not in use or during transportation.
I noticed a few interruptions in its operation and freezes when I had two mice with different receivers connected simultaneously, but it may be a coincidence.
For those who don't know, the Logitech unifying receiver can be used as follows: with one receiver connected to the USB, you can connect up to 6 devices, occupying only one USB port.
Update 7/2023
5 years after purchasing the tank-built mouse. The model has been discontinued, but it's worth adding that it still falls from the bed every day until today. With approximately 1000 falls, the scroll wheel stopped working last night, but with a soldering of a cable that came loose, it's working again like the first day. A big congratulations to Logitech for the build quality of all its products, or at least the ones I have tried so far.