I have it for 1 year and something, using it in all terrains. From summer in Athens with 45 degrees to mountains with very cold weather, dust, storms, etc.
The very positive aspects:
You won't find better ventilation in a full-face helmet. Simple and nice. You can feel the air moving inside the helmet. Extremely comfortable, especially with a thin balaclava for winter.
Very lightweight with good balance.
Very good aerodynamics even at speeds of 170+ on the highway.
It has noise - all adventure helmets do (not comparable, for example, to the gtair2 which is much more closed and has different aerodynamics). But for its category, it is exceptional.
The buckle is also very convenient for use with gloves or without.
The visor that darkens is also very good. You don't realize how much it relaxes you, especially on long trips, or how smoothly it darkens. You have to look in the mirror to see that it has darkened.
You can comfortably wear a mask and glasses without them fitting strangely.
Top-quality materials (not like Arai though).
The only negative aspect I consider is the price, which is ridiculously expensive for Greece.
On one hand, you are paying for the brand. On the other hand, you can probably get similar helmet protection for half the price.
Compared to the Touratech carbon (which is essentially a NEXX with a different logo, and I think the friend above is referring to it), it is miles ahead. The Touratech is 4 steps below.

Awesome helmet. Perfect fit on my head, the pin lock it comes with doesn't fog up at all, very lightweight, moderate aerodynamic noise, the visor comes off very easily, stable in many conditions, easy to use intercom, and the photochromic visor it comes with is worth every penny, it hasn't bothered me at all while riding at night.

I was torn between this and the A....h C..........r and if I hadn't tried the krios first, I would have blindly chosen the other one.....but having already tried the klim, the other one seemed "a bit" lacking.

And what they told me at the store, I hope it wasn't a joke, is that if you have a proven accident and the KLIM gets damaged, they will replace it through the dealership at no cost.

But......it's very expensive, although the cost includes the second photochromic visor which I don't know if you can avoid and save around 180-150 euros

Beautiful helmet. I have been wearing it for 3 years, it is light as if you are wearing a hat, it is quiet, you can't hear a thing, not even the wind, even after many kilometers. The fit, ventilation, visibility are perfect! I bought it for 580 euros back then and I am completely satisfied. Along the way, I discovered that there is an imitation of the exact same Carbon helmet for 230 euros in a well-known chain of motorcycle stores in Germany (look for it... I can't put a link here). I bought one for my wife and it is exactly the same in terms of quality, etc., only the logo is missing.