First day in my hands and I have to say that they are very good. In terms of construction, they are perfect except for the fact that they are not easy to open inside because there is no easy way, and you may ask how this is related, I will explain immediately. The woofer is a vacuum cleaner and anything that goes in front of it and fits inside gets sucked in completely. This results in whatever goes inside getting trapped, and I don't know exactly how this might affect it. In my case, after about 30 minutes of flipping it over, after I have unlocked in my mind the whole labyrinth that is inside, I manage to take it out with my heart in my mouth. Now let's move on to what you might be interested in knowing about these speakers; they are very loud and when you turn them up to the max, the sound does not distort, and the bass has made the walls shake. They are the perfect speakers to have in your home for gaming or music. As for the LEDs, I have no words; they are incredible for when you play games or listen to music. For the money, I believe they are very complete, and I recommend them without reservation. I should mention that these are my first speakers, so I can't compare them to others; I am not an expert in speakers, and everything I have written about the speakers is with their default settings without having tweaked them from their app. I will definitely provide an update to tell you about the app, developments, and to add some more things that I didn't mention.

Short version (tl;dr):
Fantasy illuminated speakers from Logitech that perform decently compared to other 2.1 speakers in the range of 70-90€. If you don't have any speakers at all, have the extra money, and want a pleasant aesthetic result in your space, choose these. If any of the three mentioned criteria are not met, stay away, you don't need them.

In more detail:
The speakers come in a very nice packaging. Their build quality is good, as they have a decent weight for their size and their plastics are good and sturdy without any creaking. They have the classic cloth in the front that all speakers have, not a metal grille.

For cable management enthusiasts, the speakers will be a challenge as there is a mess of cables. Specifically, the speakers are connected to the subwoofer with thick VGA cables (https://simple.wikipedia.org/wiki/VGA_connector), the woofer, which is also an amplifier, is connected to the computer with a USB cable, and to the power outlet with a separate power cable.

The lighting is intense, powerful, and with good color reproduction. The speakers have two lighting zones that can be controlled independently both in terms of color and effect. One zone is on the back of the speaker in a round shape like a small projector, and one zone is on the side of each speaker, resembling a multi-lane road (!).

Their (default) sound is peculiar. It lacks the clarity and liveliness that I'm used to hearing from other speakers. It is a bit muffled and has a lot of bass, as if it's coming from somewhere deep. It doesn't seem to emphasize the mids and highs, but rather the low frequencies. I also expected the subwoofer to perform better in songs that rely on it, such as hip-hop/R&B genres - I expected it to create that "earthquake" feeling (like the subwoofer of the Z906 that I have in the living room), which it DOES NOT do. If the sound is adjusted through a preset or the equalizer in Logitech's software, it improves significantly, but even at the best possible settings, you can't enjoy clear mids and highs. Their volume is directly related to the Windows volume and reaches high levels (I operate them at 25-30% for a normal gaming room volume). However, any value above 50% simply worsens the sound quality rather than providing enjoyment.

You will need Logitech G-Hub software to adjust them. It has nice features that range from sound (presets/custom equalizer/surround - which I haven't tried, but with a 2.1 setup, what surround can you get), to lighting (zones/color/effects/synchronization with other Logitech devices), and of course, the highlight of these speakers (for anyone who has seen the marketing videos), which is the screen sampler. From the image reproduced on the monitor, it can make the speakers take on the appropriate color to provide a deeper experience (immersion) in movies and games.

For me, the speaker factor (because we're talking about speakers primarily) is rated very low as the sound quality itself is mediocre. Based on this, I would say they are below the level of the Z533 (which cost around 80-90€). On the other hand, I understand an increase in the price point when we are talking about speakers that have a bunch of customization options in sound and light, and some intelligence in terms of software behind them to take colors based on what one sees on their screen. However, for me, even so, the €250 price tag is not justified, especially when depending on the motherboard and USB port they are connected to, they may experience random disconnections even 2-3 times a day (it was a frequent occurrence with my Gigabyte, not so much with the ASROCK I have now). The only reason I can think of to recommend them to someone is if they don't have any speakers at all, they want something nice for their space if they support the light/RGB phase as a person, they are a gamer (not an audiophile), and they don't mind spending an extra €50-€60. I mention this amount because I believe their initial price should be around €180-€200 maximum.

I give it 3 stars because I had a serious issue with the speakers, specifically a cable got cut in the left speaker a few days after I bought them.
That's when the problems started.
First of all, there is no authorized service in Greece or in Europe.
I found a phone number in Greece, but when I called it, it automatically connected me to the US, where a Logitech representative informed me that there is no official service in Greece.
And if you think that the problem could be solved simply by isolating the cable, that didn't happen either.
While I fixed the cut cable, the speaker no longer lights up at all, although it still plays normally.
The other problem is that in order to play music from sleep mode, I have to disconnect the left speaker initially and reconnect it, otherwise nothing plays.
Literally serious problems that probably have to do with its software. I tried upgrading the firmware, but that completely rendered the left speaker useless, so I had to downgrade the firmware again.
However, it is unacceptable for a company like Logitech to not have an authorized service, if not in Greece, at least in Europe, so that you can send their device for repair.