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.
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