The rating is based on the market price, which is often below 90€. I wouldn't buy it at prices like 150€ as there are better options available.
I also own the Ariete 2761, which is corded, and an older green Primo, also corded.
The "vacuum cleaner" was mainly purchased for use as a handheld vacuum (my wife's requirement), but I believed it would also work as a regular vacuum. Handheld vacuums with 18v power can be found for around 75€, so paying an extra 15€ for a 22v "vacuum" makes sense.
Now, onto the details.
Power - quite good during the first vacuuming, but the dustbin is small and with three cats, the filter quickly gets clogged, resulting in a decrease in performance. It still sucks quite well, mainly because it has a rotating brush that collects various debris. It performs moderately well with cat litter, meaning it requires more than two passes to pick up everything as it tends to push some pieces and throw away others. If it didn't have cat litter, I would say it is very good. The above applies to the high speed setting. There is no difference in picking up hair and dust on the low speed setting, but the high speed is needed for heavier and compact debris.
Battery - it lasts a long time on the low speed setting and long enough on the high speed setting to clean a whole house of about 120m2. We charge it 2 to 3 times a week.
Flexibility - This is its strong point. It stands upright on its own, taking up very little space. It cleans under tables, chairs, sofas, and furniture like a regular electric vacuum with a dustbin. It has the accessories (nozzle and fabric brush) permanently attached to the handle, so you can reach any spot quickly without having to go to the storage to find the attachment, etc. I find the light on the brush very useful because you can vacuum with very low light or with the lights off and see exactly where you haven't cleaned yet, as the dust is very visible with the light. I would like the attachment for corners to be a bit narrower because it doesn't fit, for example, in the gap between window frames, but that's a minor detail. We use the vacuum for the whole house, stairs, ceilings, everything (except for the gaps between window frames, where we use the Primo because of its narrower nozzle). It doesn't damage the floors, and overall, it doesn't feel heavy during use, so it doesn't tire out my wife, who has weak arms.
Cleaning - dustbin capacity. This is the most important issue for me. The dustbin is small and needs to be emptied and cleaned frequently, which is fine, but you have to stick your finger inside to remove the debris because it gets stuck between the filter and the dustbin. The major issue is the HEPA filter (which is a positive feature) that quickly gets clogged with dust. You can remove it and blow compressed air to clean it, but if you want to wash it (which needs to be done occasionally), you have to wait at least 24 hours for it to dry completely, leaving you without a vacuum. In some other vacuums, you can use a paper towel to collect most of the dust, but here there is no space for that, nor is there enough suction power to pull all the debris from the filters. In short, after the first vacuuming, you have limited power if you don't clean it, whereas the Primo had much more tolerance for this. The sole, on the other hand, does much better with much fewer hairs than some robot vacuums we have. Note here that I have put some protectors on the sole in certain areas because I had the impression that it might touch exposed plastic on the floor and I had a bad experience with the Ariete 2761, which caused small scratches on the floor in no time, so I decided not to risk it, but 99% of the time the protectors are not needed.
I have no issues with the build quality, nor has the bin ever opened while in motion or anything like that. It is lightweight in hand, there is no need to lift it and reposition it, and as for durability, I have had it for 5 months without any issues. It is also positive that there are replacement batteries available, so you can get a new one when the old one wears out (which will happen at some point with mathematical accuracy).
In conclusion, for under 90 euros, it is a very decent choice, as long as one does not expect it to perform like a Dyson. I would not buy it for over 120 euros, I would go for a Xiaomi or one of its subsidiaries for 150 euros, which, from what I understand, do a better overall job.