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I have had it for 2 weeks on a PC (~350w), 3 monitors, networking devices, and a sound amplifier. All together they consume about half a kilowatt.
I have connected an external 22Ah lead-acid battery in parallel with the internal one, giving me about 45 minutes of autonomy in case of a power outage with the PC idle and the monitors on standby.
With the internal battery alone, it only lasts about 7-8 minutes.
BUT BE CAREFUL: if you want to add extra batteries, make sure they are sealed because flooded ones have slightly different operating voltage and may be damaged over time. Mod at your own risk.
When everything is under full load, the top part gets a little warm and smells slightly like plastic even after all these days, but luckily the room is well-ventilated (it also warms my feet).
It cools passively with vents on the sides since there is no internal fan.
Also, when it is in backup mode, the transformer can be heard slightly in absolute silence.
It has never complained about overload as my power factor is very close to 1.
For its price, I recommend it because it is very difficult to find 690w at this price.
I will update in the future for any changes.

Update: the plastic smell has completely disappeared and now I can sleep with it next to my head.

Two of them entered the room and I control them through openrgb from the computer to have all the lights synchronized after installing custom firmware on them (the review refers to the factory firmware).
The intensity is very good and they reach 800 lumens, but only in natural white... the warm one is around 600 and the cool one is 700-750 (measurements with a brightness meter). The RGB plays around 400-550 depending on the color.
They connected to an aftermarket access point and haven't disconnected for 3 days (100% uptime). Those who complain about disconnections, etc., should check their garbage network instead of criticizing the bulbs.
Regarding the application: simple for basic settings and has a menu for advanced users who know more and want to get involved. It has basic automation settings and has smart home integrations (Google Home/Alexa, etc.). A huge plus is that it simulates the light of the sun during sunrise and sunset... it may sound silly, but it has helped me a lot to wake up in a good mood as I live in a basement without windows.
We will see durability over time... I will update it for any potential issues.

Coming from Motospeed CK108 with black switches.
First of all, in terms of build quality, it feels very sturdy and quite heavy.
I got the version with aqua switches and because I've been using linear switches for 6 years, the small, almost imperceptible bump makes me feel strange. As for typing, it feels more accurate because you can feel when the switch registers, but for gaming, I haven't decided yet (I've only had it for a day, I will update the review in the future).
The RGB lighting is very powerful, so much so that I have it on the lowest setting to avoid being bothered when watching movies, etc., and the colors have satisfactory shades.
The software is mediocre. It has many available settings but also quite a few bugs.
Of course, after setting up macros assignments, etc., I simply closed it and haven't opened it again. I control all the RGB settings through openrgb and artemis2/aurora.
It has onboard memory for 3 profiles.
I would say that the lack of dedicated multimedia keys is a major drawback when spending so much money on a keyboard.
That's all for now

Today I received them.
It will be a lengthy review, so grab a coffee and relax while you read.
As the owner of the Razer Kraken USB (first revision), which broke after 10 years of endless gaming due to the plastic headband, I decided to go for something cheaper so as not to commit to a brand with a lot of money.
I had tried a NOD mouse a few years ago and I was satisfied, so I decided to try the brand again.

Regarding the sound:
While they have strong bass, it is somewhat muddy. I measured frequencies with a sound recorder and at a fixed frequency, it produces some irrelevant sounds at a lower volume.
The midrange is good across the entire spectrum, but the highs, like the lows, have some issues. It's not something tragic, but if you have heard good headphones (no, I'm not talking about my Razer ones), you will notice the difference.
The microphone, based on the recording I made, is simply adequate, with a strong emphasis on the highs, which gives the illusion of clarity, as I read in other comments.

In terms of build quality:
The plastic is of decent quality, nothing tragic, but not what NASA puts in its rockets either.
The ear cushions and the leather headband are a bit hard for my taste, but they don't feel like the faux leather that Razer uses in their headphones.
The top part is just plain plastic without any padding, and it's the worst plastic you will feel on the entire headset.
They have height adjustment for each earphone, without any other customization options... no tilt, no folding, nothing.
The microphone is flexible and stays where you leave it. Unfortunately, it is not detachable.

As for the extras:
The sound card is located on the cable and has 4 buttons with a wheel for volume control on the sides. One button mutes the speakers, another mutes the microphone, another controls the headphone lighting (not the controller), and finally, a button controls the vibration.
The vibration reacts according to the bass and synchronizes with its frequency. It is generally a welcome feature and enhances immersion, especially in movies with many explosions, etc. (think Michael Bay).
The lighting is present on the sides of the headphones in a wheel that jumps between 3 zones and 3 colors (yellow to orange, pink, and cyan) every second. The logo in the center does a rainbow cycle, while the microphone and controller have a steady blue light.
It also has software, which unfortunately doesn't do much that you can't do with third-party software.
The only options are a basic EQ with 5 frequency bands, sound effects like theater, bathroom, living room, etc., microphone volume adjustments, and virtual surround sound.
It also has profile import/export and you can have 4 sets of your own.

Now let's move on to the negatives:
I don't think the plastic of the headband will withstand much, based on how it feels. I hope I'm wrong.
It requires intensive EQ to get the sound right, especially in the midrange and highs.
The RGB lighting is not customizable, neither in terms of colors nor effects nor brightness. Additionally, the controller light does not turn off, as mentioned before.
The cable, although quite long, is a bit thick, at least for my taste.
It is somewhat bulky and heavy, not excessively, but above average.
The software is terrible. It looks like it came from the 90s and doesn't change any settings on the sound card. The only thing it does is change options that you can already change through the operating system.
The surround sound is laughable, inaccurate, and distorts the sound a lot. You will have much better results through Windows Sonic or some other application. I tried it on CSGO and had the best results with Razer's surround engine in combination with 5.1 output within the game.
The volume adjustment of the controller is analog, I would prefer it to send a command to the device to change the volume, like the deafen button does.

That's all from me for now. I will update the review for any future updates.