Pros:
• Easy device switching with the press of a button (up to 3 devices).
• Aluminum chassis.
• Long battery life.

Cons:
• The keys have a non-slip coating similar to the MX Master 3S. The result? Fingerprints remain on the keys. On the mouse it might not be annoying, but on a keyboard the light reflects off the fingerprints and the letters are not visible.
• The letters are in light gray on a dark gray background, so they are not visible at all without the backlight on.
• The backlight does not stay on permanently. It turns off in 2-3s as soon as you remove your hands, and takes ~500ms to turn back on when you return them. It is absolutely annoying, to the point where I completely disabled the backlight and use an LED bar on the monitor. It has 5-6 useless effects and does not support the most basic function... Some say that if you open it and disable the sensor, the light can stay on, but I am not going to risk damaging a brand new device, nor do I want to lose the warranty from day one.
• Although tactile and not clicky, compared to traditional membrane keyboards it is significantly noisier.
• When I switch devices from the keyboard, there is no option for the MX Master 3S mouse to switch automatically as well. This cancels out the whole logic of using an ecosystem of devices from the same brand.
• Low profile keys that do not suit a full-size keyboard. What do I gain?
• Small gaps between the keys, resulting in often pressing adjacent buttons.
• No extra gap between the row of functional keys (F1, F2, etc.) and the number row.
• The F keys are grouped in fours with different colors and not with spaces, so you cannot navigate by touch alone.
• On the F keys, only the custom function icon is illuminated and almost not at all the key name.
• Small width on the left Shift.
• You cannot use other caps, because the spacebar has its own design, different from common spacebars.
• Not available in Greek language.

In the end, at these prices, the design, materials, and functionality are unacceptable. We encounter ergonomic problems that were solved in keyboards 40 years ago. As a programmer, I was extremely satisfied with the MX Master 3S, but on the contrary, the MX Mechanical has nothing to do with the productivity category.

Excellent construction quality, incredibly discreet sound for mechanical, although I got the version with those exact switches. Oh! Excellent construction quality that makes you feel like you got it cheap again, I said? I got the full-sized one that also has the perfect size for every desk, and I think I'll pass it on when I'm done, too.

USB type C is now mandatory in my opinion, the port is sturdy and the charging is fast for battery life, which you simply forget about for endless days. The battery performance depending on usage load is exemplary. I'm not even talking about weight, key programming, this Master series has it all in its pocket all the years I've been using it.

I have it in Bluetooth connection and it has a fantastic low response time, so unless you're a hardcore gamer, it suits you, it's perfect for LoL. And for those who consider BT slow, use the LogiBolt dongle - which is far better protocol than the previous Unified Receiver - and it will be exactly like a hard-wired connection.

In work and typing, it's comfortable for hours, the backlighting is fantastic with an extra perk: even if you touch it on its body, it lights up whenever you don't need to blindly press buttons in the dark and mess up your PC.

The lighting adjusts automatically to the room's brightness, it only has white and very nice options for variations in the pattern, ideal if you don't like the colorful circus that is in fashion. It connects perfectly to Windows, Linux, and Mac.

From the first MX Master mouse I got in 2015 until today, it's not going to release a refrigerator, is it? I'll get it if it's in the series. I'll give the MX Master 2s to my girlfriend and I'll get the 3s to complete the USB3C set!

For me, the best wireless keyboard on the market. Excellent aesthetics, especially if you're over sixteen, and for every task you can use it for.

I am the owner of the Mx keys - Mx master 3 and now also the Mx mechanical and Mx master 3s. I will try to focus on their differences:
- MX keys full size: Very beautiful membrane keyboard (quiet) that I initially liked a lot, but then I realized that with a membrane keyboard you can't type fast!! You probably can't change its rechargeable battery either!!
- Mx Master 3: Awesome mouse for work, mainly suitable for large hands (palms), but I was annoyed by the clicking sound it makes when you press either the left or right button.
- MX Mechanical Tactile quiet full size: It is mechanical, so typing is faster with it.
- It has the F keys aligned with the numbers 1, 2, 3, etc. The tragic thing is that both keyboards have the same small gap in the F row as the other rows, so when I try to press 1, 2,... I end up pressing the F buttons!! It would have been perfect if they had a few millimeters more gap! It has a small esc key. It has 5-6 different backlight modes. They can be programmed through the Logitech Options + all the top keys plus the 6 buttons below the switches (except for the esc key obviously). They say on YouTube that it doesn't have good key caps, they are ABS, so after a while they will shine and maybe turn yellow!! Indeed, these caps retain the oil from your fingers and smudge a bit! Although they say they have a slightly rough surface and things are slightly better. Time will tell!! All the caps can be removed and replaced except for the space key!!!! The ABS ones have the advantage of being lighter! Also, for the switches, they say it is not a good and expensive brand and that it makes a slight scratching sound, but it hasn't bothered me. In contrast to the MX keys, which has a small light above the caps lock, this one doesn't have it, and when you press it to turn it on, the letters flash for a second to indicate that it is on. The function with the light was better because you could see it continuously on. It also doesn't have Greek characters on the keys. In contrast to the MX keys, it has 4 keys to the right of the space (they have added the start key and others on the right). In the Logi Options + application, you can see, unlike the MX keys, the battery percentage of the keyboard and the ms master 3s. Compared to the ms keys, the shortcut keys have also changed on F5-F8 with different functions. Through the amazing application, Logi Options +, you can change them to do whatever you want, all the top buttons and the 6 I mentioned before. The letters on the keys are not centered like on the MX keys but are towards the top. I will also include a photo for all of this for you to see. Although I have measured it (dimensions of the keys among themselves and the entire row together, compared to a wired mechanical keyboard from the same company, and the measurements came out exactly the same in size), I think I make more mistakes with this one compared to the simple wired one! Maybe it needs some time for me to get used to it. It can be connected either via Bluetooth or with the Logi Bolt Receiver, unlike the keys, which are with Bluetooth and the Unifying USB Receiver. The Logi Bolt is considered a next-generation connection, and with one bolt, you can connect both the MX mechanical and the MX master 3s. Each product in the packaging also includes a bolt. Something amazing through the logi options + application in the settings of the ms master 3s mouse, you go to flow and if you install the logi options + application on another computer (probably on the same network), when you move the mouse to the edge of one screen, the mouse enters and there is an automatic switch of the keyboard to the new computer, allowing you to write and move the mouse on the new computer without needing to press the option 2 on the keyboard and mouse (this is also done by the mx keys and mx master 3). It also has the same charging cable as the mx keys, which is type c and connects to the keyboard with type a on the PC, but it is relatively short, with a maximum length of one meter! I expected them to change it with the mx mech, but for economy reasons they did not put a longer one. The battery, from what I saw in the prospectus, should be removable and replaceable, which is very good for longevity! It has feet underneath if someone wants to lift the keyboard, but only in one position, it would be perfect if it had two different positions (the mx keys has a standard low height that is not adjustable).

- Mx master 3s: Differences from ms master 3: (Design-wise, it is exactly the same as the 3)!!
- They fixed the annoying click click on the buttons that I mentioned above, but now they made them almost completely silent, which is an exaggeration to the point where you think you didn't even press the button!! An intermediate noise would be ideal!
- It comes with the new Logi Bolt Receiver in the packaging.
- In the logi options + settings, you can see the battery percentage.
- In the logi options + settings, you can change the speed and dpi up to 8000 dpi, unlike the mx master 3, which supposedly has up to 4000 dpi and its nominal working dpi is 1000. Personally, when I set it to 4000, not even 8000, I lost the mouse, you can't even see it moving so fast, so it's probably useless!
- Finally, they say that the mx master 3s can also work with iPad OS, something that they say the 3 cannot do (I haven't tested it yet). However, with the keyboard, I can still type on the iPhone even with the mx keys!

Conclusion: Mx mechanical: It is very beautiful and with the logi options + application, in combination with the ms master 3 or 3s, it works wonders, for example, if you have two or three computers nearby and want to control them (PC or Mac, or PC and Mac). In my opinion, it is faster in typing than the mx keys, but I make mistakes in typing, so I don't think it is ideal for someone who writes 10-20-30 pages a day. One person on YouTube said that they type better on the mx keys than on the mx mech due to spacing! Between the two, I prefer the mx mechanical!!
- Mx master 3s: If you already have the ms master 3, I don't think it's worth the update, wait until next year, the 4 will probably be released!
If you have another mouse (for work, not for hard gaming), both the 3 and the 3S are amazing. That's it.