http://www.guru3d.com/news-story/noctua-teases-nf-a12x25-fan-almost-4-years-development.html
 
the distance between the frame and the fan blades is a staggering 0.5 millimeter, this normally is 1.5 and sometimes even up to 3 millimeter.So it should offer very silent cooling. In my opinion 4 years of research should yield some spectacular results. Noctua showed off prototypes during CES 2017, but now they are almost ready for launch.
 

wonder what the results will be in terms of stats, and if a 140mm version is in the works.

Yeah, the color scheme isn't pleasing to my eyes.

I checked out the site just now, seems they are starting to understand the idea of "color" https://noctua.at/en/products/product-line-chromax
even if it doesn't apply to these fans. no LED anything yet however.

They make amazing stuff. It is quiet and effective. Ugly as sin, though, but my pc is purely utilitarian and is under the table anyway. I replaced all fans in my PC, including ones over CPU water cooling, and now, even under heavy load, my PC purrs like a kitten. Great for powerful and quiet systems. 

This is from Vortez Review....
 
Our testing showed this fan blows everything else out of the water, including the Corsair ML-120, a fan known for its excellent performance.
 
The construction of the fan is “no compromise” in every single way, going to unbelievable lengths to ensure optimal performance and minimal noise in the process. The fan is easily the heaviest we’ve encountered, tipping the scales at a mighty 201g. A Corsair ML Series 120mm fan, for example, weighs 148g. Noctua believe in their product so much, they tag it with a 6-year warranty; not shabby at all!

To round up, if you’re after the best performance or silent operation, this is the only fan we can recommend, full stop. Yeah, it’s pricey at £26, but that is absolutely warranted in our opinion.
 
 
Guys what you think, I need 3 fans, CORSAIR ML120 PRO had biggest chance.
I always wished Notcua fans but color prevent me. 6 years warranty is long period, but price is 30 euro I saw.
What you think, I should order these days fans. This Noctua adapter give you opportunity to use him on 140mm radiator.
 
400-1700-2000 RPM, 1700RPM is sweet spot for silence/performance.
But only if fans are excellent. They need to be excellent to people keep them on 1700-1800 RPM.
That's like 1200 RPM on fans from past.
 
I have idea to completely ignore fan color and look or to hide them behind radiator.
 
I can't find information about weight, GT was 200 gr... Amazon say this fan is 900gr, 2.2lb, others are 0.9
That's not possible. 

 
After all that time spent on it, the product better work miracles. LOL.

To be honest, it's not the colour of their products that dissuades me from jumping ship despite all the rave about performance. It's the price. For example, when purchasing a CPU cooler I chose the Deepcool Lucifer over the Noctua NH-D15 and the performance difference is minimal. But the prices, respectively were $50.00 and $140.00. Not worth the extra cost.

panzlock
To be honest, it's not the colour of their products that dissuades me from jumping ship despite all the rave about performance. It's the price. For example, when purchasing a CPU cooler I chose the Deepcool Lucifer over the Noctua NH-D15 and the performance difference is minimal. But the prices, respectively were $50.00 and $140.00. Not worth the extra cost.

Price is insane, 35 euro is one in Hungary, 40 euro one in my country.
Some guy got 6 review sampleas and I success to buy 3 of them for 60 euro.
But we must be fair, these are not decorative fans to change them every year when new RGB design show up.
These fans are to finish job next 5 years and that's it.
I'm sorry because they not share my vision to launch in Redux color scheme, same fan. 
That would be amazing fan.
 

Now they need to reproduce that in a 3 speed 200mm fan.  800, 1000, and 1200 rpms would be sweet.

HaywireHaywood
200mm fan

I'm impressed of sleeve qiality.
They look really well.
Cool fan no doubt, I'm glad I find them for so cheap price.
First 6 arrived in Serbia for review. They are tested, I bought 3,
3 others are sent to other site for testing and guy will keep them for him.
I'm not sure I would pay 50 euro more for same 3 fans, 110-120 euro, I'm not sure,
I was ready almost to give up and order ML120 PRO.
I still wait to finish test for adapters to send me for free. I had really luck to saw them on market place.
 

 
One thing make me happy, I really liked Gentle Typhoon, but he had flaws, poor frame paint, no sleeve, he had 100-200RPM space to run faster, 2150 RPM was rear and expensive, once painted there was good change to disbalance them because paint screw up performance, blade become heavier, etc... It's extremely hard to pain them to look good and to keep same performance. You need expensive paint, primer, sleeve... etc... That cost same as fans or more.
These are 2000-2050RPM, better frame, better blade material, better and more accessories, better controling with BIOS and PWM.
Pure win. NF-A12x25 recommended. This is fan and for normal CPU cooler. 1700 RPM and two fans could give you 5C lower temps.
I know many of you keep 20 old fans in house, sold them for cheap price and buy these.

Well, they are a fan/cooling company, not like they have much else to do.
Also this topic is 2 years in the making, so maybe like this topic, they ignored it for most of the time it was in development.

4 years huh.  Need to hire some smarter folks.