I've had it for about a week and I'm using it for urban use.
I can say that overall I'm satisfied so far. The inner lining is quite comfortable. You have good peripheral visibility. It has an internal dark visor with intermediate steps; it doesn't drop down all at once, but has steps. The side slider that you operate, however, I find somewhat cumbersome, especially when using winter gloves, as it is level with the helmet shell without protruding much. It has a chin guard, which I consider very cheap. Essentially, it's a mesh fabric, which I don't think holds much. This results in feeling a draft at the chin and towards the nose, even with the front vent closed. I used it in temperatures around 4-5 degrees and you could feel the cold coming in, so I had to wear the balaclava up to above my mouth inside the helmet and not just up to my neck. I'm not saying it lets in a lot of air, you feel a cold draft, but with a proper chin guard, no air would pass through at all.
The top vent makes a difference, as it's the first time in years that I can feel a difference between open and closed. In recent years, I had a (terrible) Caberg Duke II where all the years I had it, I struggled to understand when I had the top vent open or closed, and there was absolutely no difference in summer or winter!! The front vent also lets in air, which hits around the height of the nose. Of course, it's worth mentioning that the riding position and the motorcycle play a role, just as they do for noise. And since we're on the topic, I find it to be more on the noisy side than the quiet side. I didn't notice a significant difference from the Caberg Duke II I had (in which both flip-up latches broke without any fall/hit!!!! resulting in it not sealing, so air/noise came in more easily). Perhaps the noise starts at a few more kilometers in the Nolan than in the Caberg, but nothing notable.
Keep in mind that it comes in many colors and designs, not just the 6-7-8 you find in Greek stores. Searching online, I've found at least 25-30 different color/design combinations, and there are probably more. It also comes in various versions; the most common are the special and classic, with the only difference being that the special does not come with an anti-fog pinlock in the package and you have to buy it separately (which is why it has a lower price than the corresponding classic).
Finally, I should note that this particular model has one shell size, which means that from XS to XXL, the helmet has the same (large) size (and almost weight). By the way, the weight didn't bother me particularly, maybe because I've been used to flip-up helmets for so many years.
I believe it's worth the 250€, I consider anything above that a bit excessive. I also find the pricing that all brands have on colors and designs excessive. For example, charging 30 euros more for a solid color that is simply not the classic black/white and 100 euros more if it has a design, which could just be lines, is ridiculous.
4 stars because, of course, it's not a 5 (what would Schuberth/Shoei say) but I also think 3 stars is low. A fair and good (so far) helmet.