I have had it for just over 2 months and I have covered many kilometers with it.
Initially, it is indeed very warm and does not let rain through (at least not yet).
The ventilation, especially compared to the competition, is well below average as the pockets are very small and there is no ventilation zipper on the sleeves.
The overall construction quality is well below average with just 2 months of daily use, the strap of the thermal lining has torn.
The velcro on the main front pockets has completely lost its properties, resulting in the pockets opening while in motion!
I would recommend avoiding it, it does the basics decently but it will barely last a winter season of use...

Purchase for travel use! The first test was successfully passed with a 3-day trip on a mountain route. I didn't feel the slightest sense of cold at temperatures of 7-8 degrees and speeds of 100-120 km/h. Inside, I wore thermal gear and a thin t-shirt. I didn't encounter rain, so I will provide an update later. Good fit, nice fastenings, and zippers.

Update
After use on a highway trip at speeds of 150 km/h and above, temperatures of 6-7 degrees with a touring motorcycle and a duration of 3-4 hours of continuous riding but with low wind coverage because I was wearing a sport windshield. Inside, I wore a short-sleeve t-shirt and had a very light feeling of cold on my shoulders, which I considered completely normal given the conditions I was riding in.

In its positives, we have the following.

The white color is very nice up close. It is a very comfortable and warm jacket. The collar is quite high, covering almost the entire neck up to the helmet, so the need for a neck warmer is reduced (not eliminated).

It includes protection for elbows and shoulders.

It has 3 external pockets and 1 internal pocket in the thermal lining.

I cannot judge its resistance to rain as I have not been in the rain. In terms of warmth, it is very nice. I wear it on an island and the lowest temperature is around 2-3°C with the corresponding island humidity, and it has kept me covered. In combination with gloves and neck protection, the torso remains fully warm.

With the use of the 4 vents, it can be worn comfortably in autumn and spring.

With a good combination of vents and thermal lining, the jacket can be worn in autumn, winter, and spring. It is not suitable for summer under any circumstances.

Here are the negatives.
The white color is nice but it stains easily.
Back and chest protection are not included.
Dainese states on its website that it has an internal waterproof pocket. This pocket is also the housing for the chest protection, so if someone uses the said protection, they lose the pocket.
Dainese also states on its website that the internal lining can be used alone as a jacket. This is true if the pants (like motorcycle pants) go up to the stomach. If it is regular pants, the belly remains exposed and we have a cropped top winter jacket.
It would also be good if the 3 external pockets closed with zippers instead of Velcro.

For the money I bought it for, €280, it is a good purchase and value for money for Dainese. Now that the price has increased by €50, I believe there are better options from other brands.

The worst part was the missing and misleading information on the product's official website. I would still buy the jacket, I just wanted to know what I was getting before buying it.