In the product, I gave it 5 stars because it truly deserves its price. It is a high-quality cooler, completely silent, and does what it's supposed to do (lower the temperature). If you have a PC with a window, it's a joy to see it. However, it is huge. It requires experience to install it on the motherboard, then around it, and then in the case, and also to do good cable management. On the motherboard I installed it, the graphics card barely touches the rubber pads it has on the corners. That is, if the PCI was half a centimeter further, I would have wasted money. Personally, my hands got bloody in a couple of spots because after I installed everything, I realized that one screw on the motherboard wasn't tightened, and then removing and reinstalling it was a hassle. I have built many PCs, and I think next time I will get a cooler with 120mm fans instead of 140mm ones.

I decided to change the cooling system of my Corsair because I wanted to have peace of mind and prevent any leaks inside the case! So, I decided to go with Noctua! The results? The temperature of my i7 9700k, which used to reach 75 degrees, now stays steadily at 61 degrees while gaming and streaming simultaneously! It's an amazing, silent cooler that fits perfectly and looks beautiful! Now I don't have to worry about any tubes running inside the case! I realized that liquid cooling only offers visual effects and nothing substantial! Choose the 14s instead of the 12s if it fits in your case, after all, it's worth paying a little extra for something good!

The only thing I didn't like is that the surface that comes into contact with the processor had marks from the processing tools. I didn't expect that from such a high-quality product. At first, I thought it probably wouldn't matter since Noctua left them there. However, in the end, I decided to retail it and dropped another 3 degrees Celsius. It went from 81 degrees Celsius to 78 degrees Celsius on a Ryzen 3600. Of course, I feel more comfortable when the CPU is below 80. Everything else is good. Quiet, great warranty, excellent support from Noctua.

The cooler is perfect, (relatively) quiet, and easy to install. The only thing I don't like is the color of the stock fan, but at least there is the Chromax series from Noctua which has black fans, although they are relatively expensive. Of course, the colors are clearly visible in the product photos, so I don't consider this a negative.

I have it on an Asus Strix X370-F with an AMD Ryzen 7 2700X (undervolted to -0.0875V), all inside a Fractal Design Define C. The temperatures never exceed 75°C, while the cooler remains quiet at low to medium loads, and in full use of the processor (all cores at 100%), its presence is simply noticeable without becoming annoying.

However, if I overclock the 2700X to 4.2GHz @ 1.37V, then the temperatures in Prime95 Small FFTs stress test rise to 82-85°C. Of course, I don't consider this negative as this specific stress test loads the processor much more than a "normal" application would.

Very good and with excellent temperatures! It's a great CPU cooler, it handles my R7 2700X with ease. 5/5 kudos to @Noctua_at

Apart from the fact that it is bulky and relatively ugly (I have the Corsair 570x case and it shows), we also have the following:
1) Completely silent when you put your ear next to it with the case open, which was the main reason for my purchase.
2) As for cooling, there is no discussion. I have it on an 8700k and it has never gone above 45 degrees, even with 3 games open simultaneously for hours (wow, guild wars 2, hearthstone, with CPU usage at 32%), with room temperature somewhere between 20-30 degrees of course.
I wouldn't need anything else besides a cooler

+ Completely silent.
+ Very high cooling capacity even in hot weather.
+ Does not obstruct (in 90% of cases) memory modules in terms of height and width, even in a 2011 socket.
+ Easy installation and fits in most cases.
+ 6-year warranty (mainly for the fan) and excellent factory service.
+ Compatible with all motherboards, meaning you won't need to buy a new cooler for a possible upgrade or Intel-AMD change.
- Only comes with one fan in the original packaging, and if you need a second one, you'll have to spend around 25 euros extra.
One of the best air coolers currently available, easily replacing AIO liquid coolers and relieving you from the stress of installation, maintenance, and the uncertainty of hardware damage from leaks, etc.
Purchased for 75 euros and I believe it's worth its price.

The base is perfect. I haven't had an easier installation.
2. My am4 bracket came from Austria for free with courier in 3 working days (including the weekend).
3. Ryzen 1700 - 3.8 GHz 1.28V - prime95 max 65C / IBT 67C
4. The appearance is a matter of personal taste, whether someone is bothered by this color or not.
5. It fits comfortably in the obsidian 450D.
6. The price for the performance it offers, which is close to liquid coolers, personally seems OK to me. It is also quiet, which from what I have read is a positive compared to liquid coolers where the fans from the radiator can be heard quite a few times.
7. I don't think it's worth getting the dual tower version (D15). The temperature difference is small to justify getting such a larger cooler.

Perhaps the best air cooling on the market.

Extremely easy installation in cases due to its compact size compared to the D15.
Excellent build quality (possibly the best in the world).
6-year warranty (especially in case the fan fails, which is not cheap).
Impressive performance that rivals more expensive liquid coolers like the H110.
Even the included thermal paste is of good quality.
The price objectively is not low, as we are talking about the version with 1 fan, and of course, in absolute performance, it falls behind the D15 with 2 fans. However, its main selling point, among others, is that it is cheaper than the second option and it doesn't take up as much space in the case.
The appearance could be better, although personally it didn't bother me.