Honestly, I was relatively quite disappointed with the mouse after seeing/hearing nothing but praise for it. Logitech generally makes some of the best mice, has quality SW, sensors and good materials. So it's even harder for me to understand who thought it was a good idea not to give the mouse its own memory, so you need to have SW running all the time to take advantage of all the mouse's features. The SW also takes relatively a lot of memory, because it checks for updates quite often, and it has its own AI crap in it. Fortunately, all of this can be turned off/removed, so you can only run what you need. However, it doesn't change the fact that you don't install SW on a corporate laptop or Linux, for example, so you're stuck with how Logitech has set up the mouse by default. And at the same time, you won't have a gesture-enabled button 5. You can't adjust the scroll wheel to suit you either. Absolutely horrible decision by Logitech, even more so when they have cheaper mice that have this feature. And lest I forget, the mouse doesn't work when connected via cable. This is for charging only. Another thing I don't understand is how a mouse standing over 2K doesn't support 2.5Ghz and only runs on Bluetooth at 125Hz. Yes, you can argue that it's to save battery. However, my GPRO Wireless Superlight still gives me over a month of battery life after 4 years, which is plenty for most people. And it weighs 2.5 times less! So why don't they give me the choice of using the mouse via a 2.5Ghz dongle at 1000Hz or using bluetooth at 125Hz. And the 125Hz silence is really noticeable, the mouse movement on the high refresh rate screen is much more laggy. However, this can be survived with an office mouse. Another annoying thing is that despite its relatively larger size, you can't store a dongle in the mouse. When I mentioned the shape, the mouse is relatively quite heavy. Personally, I prefer lighter mice. You need much less force to move the mouse, which is less taxing on your wrists. I would expect a mouse primarily focused on ergonomics to be around 100g for exactly that reason. Not to be so negative, the shape of the mouse is exceletal even at its larger size. It is extremely comfortable. The shape is adapted to the hand, so there is less strain on the wrist. The buttons are quiet, light to press and give good feedback. Sensor is also great, it tracks on the table. PTFE feet glide beautifully on the surface. The infinite scroll wheel is absolutely great once adjusted in the settings, and can save a lot of time when reading through pages or navigating the coding editor. The side scroll wheel can be used beautifully in Excel, for example. I use the mouse with three devices (PC, Macbook and work laptop), so switching between devices is also a full use. All in all, I'm relatively pissed at Logitech. I don't understand some of their decisions and that made me relatively disgusted with the mouse. The worst part is that there is no similar quality and comfortable mouse on the market, so I can't really choose another product. Rapoo is not as high quality or comfortable. And unfortunately the Keychron M6, which on paper looks like an improved and cheaper version of this mouse, has a worse shape, material and SW. If Keychrone makes a new version with better ergonomics, I'll switch to it immediately and sell the MX Master 3S. If you can handle the shortcomings and you're not buying a mouse just for a work PC where you can't install your own software, I can probably recommend it. For a programmer or people working with Office it is good. Otherwise, I will hope that the new version will remove these shortcomings or that someone will make a better copy.