After 4 years of using the G633, with which I was completely satisfied, I decided to upgrade it.
The 50mm drivers make the difference. The isolation of external sounds is very good, just like in the previous model, you put them on and you're somewhere else. Yes, it doesn't have Dolby Surround like the previous model, but the upgraded DTS 2.0 is just fine. In games, I have no problem figuring out where the opponent is coming from.
Of course, the first thing you will do once you get them is to turn off all the RGB lights, there is really no reason since you can't even see them while wearing them.
The battery lasts a day and you can charge them while using them. The best option, of course, is to get a higher capacity battery if you plan on wearing them all day.
As for the creaking of the plastics that some mention... we do what we do for all creaking plastics... a little silicone spray and it's done.
The microphone is not the best. For a good microphone, you will need a desktop one, no headset has a good microphone. However, it is useful at times.
Their range is a little over 15m and even if you move away and lose the signal, they will quickly find it again once you get closer to the computer.
Finally, I want to mention the buttons, which are fully programmable and essentially function as a remote control when you are away from the computer.

Very good sound and perfect surround, although their price is excessively high compared to competitors. They were purchased for 100€ from a large chain.

They completely isolate external sound, but there is a Sidetone adjustment, so you can hear your voice and the sounds outside a little.

Very useful: You can mute the microphone by lifting it slightly upwards, and it will have a red LED that you can see with the corner of your eye.

I have noticed several times that the first time I open them, the Logitech G HUB application completely miscalculates the battery level and you have to close and reopen it to fix it.

After the initial installation of Logitech G HUB, a computer restart was needed for it to work properly. There happened to be a problem with its integration with Discord, but ultimately the second installation fixed everything.

Positives:
The battery lasts exactly as promised (12 hours without LED, 8 hours with LED) and fully charges in 3.5 hours.
Very satisfactory range.
Mute with a single movement.
You can have them wireless (or USB) with the PC and simultaneously connect the jack to another device/PC/mobile just to hear another sound at the same time (very niche use).

Negatives:
I deduct one star solely because they are excessively heavy (379g) for headphones and become very tiring even after a short period of use.
When the USB is connected, they do not work wirelessly with another device (only with the jack).
The buttons it has for shortcuts or macros may not be useful to someone, unless they want to play with Discord.
Unfortunately, the LEDs are unnecessary as you can't see them to enjoy them, but they are quite intense.
There is a very annoying clicking sound when you rotate them, but nothing is damaged.

Initially, I have changed several headsets in the range of 100-250€ (clumsy & burnt-out gadgets)... I also had the g933 which I sold as a set along with the g903 and a gaming laptop. The g933 had a slightly better microphone and sound quality despite having 40mm instead of 50mm drivers.
Firstly, you won't find wireless headphones or mice with lower latency than any other brand, tested.
Secondly, for those who say that virtual surround doesn't work in combat competitive games, obviously they saw it on YouTube and never experienced it themselves... They didn't turn on the surround after all.
I realized how different it was compared to hyper X - steel series when, after a death, I saw my teammates asking if I had cheat mode on when I told them where the enemies were coming from. Of course, it requires practice and game-specific settings.
For which, thanks to the community, I got them ready-made.
Thirdly, yes, the battery doesn't last very long. Especially if you have the LED lights on, which party with every hit you take.
There are 4 solutions: 1) turn off all the LEDs
2) let it charge when you're not playing so it's ready when you need it.
3) keep it permanently connected via USB (you might say they're wireless, I'll get wired if that's the case. No difference in sound because they have their own amplifier.)
4) change the battery, put one with more mAh that has the same size (AliExpress has many if you search). That's what I did towards the end.

As for some people who mention music. They work just fine and have corresponding settings that are retained even when you connect them to a mobile or TV. You just need to search once and set up 10-15 profiles for gaming - music - movie, and they will automatically activate depending on the program you're running, or manually if you want to use the buttons. If, on the other hand, you're an audiophile, obviously they won't meet your needs, so you should look for other options like audio technica, etc.

For me, I would look for the g933 if I could, which have a noise-canceling mic and slightly better sound.

Do not buy it. Just saying.
The G533 is a superior headset in all aspects.
I bought the G533, the microphone broke, so I thought I would upgrade and get the G935. Big mistake. It's heavier, the battery lasts for 11 hours (without LED) and takes 6 hours to charge. It only works with GHUB, not with the old tested Logitech software. It has a shorter range, and when it loses signal, you have to pray it will work without restarting the entire PC, while with the G533 it just works directly.
The sound is worse, yes, it's very loud with strong bass when you turn on DTS, but it distorts everything and sounds muffled.
I returned it and got the G533 again, cheaper, lighter, better battery life, better sound, very strong bass and volume without activating the fake Surround (which ruins the sound).
I will just be careful with the microphone so it doesn't break again, I won't use the boom, but the button for on/off.

The only thing the G935 has extra is the (useless) LED lights and the fact that it works with a 3.5mm jack without a battery (e.g. on a mobile phone). It has a removable battery, easily accessible, but who buys a spare and from where? And where will you charge it if you get a second one? Useless.

In general, it is a good headset for someone who wants wireless and Logitech, but it is very expensive for what it offers.

The sound was okay. For gaming, you don't need anything more, you can understand what's happening around you. For music, it loses a lot.
The surround sound didn't work properly for me many times, resulting in sounds that I heard on the left also being heard on the right. I have seen better surround software from other companies, but in general, surround is for casual gaming and movies, I don't recommend it for competitive gaming (e.g. CSGO). Not from Logitech, not any surround.

I have a big head, but mainly big ears. No problem with the ear cushions. It is not heavy compared to the market, weighing 379 grams. But it is quite uncomfortable for long (2+) gaming sessions and I feel pressure from the weight on my neck quite quickly. (those who have been in the military, it is a similar feeling to wearing a helmet) This happens because Logitech chose a strange design for their headphones, resulting in the weight not being distributed correctly, not at all correctly...

The build quality, although it looks sturdy, also looks cheap at the same time. Many plastic parts appear to be made of poor quality plastic. It also creaks when you stretch it.

I would give it 2 stars, but the buttons on the back of the headphones save it somewhat. Useless on one hand, on the other hand, they may be useful for some to adjust anything.