I bought 4 of these fans (3 in one roll and one separate) to replace the original (almost ineffective) 120mm fans in the Eurocase MC G Apex and add one to the back. The first problem I encountered was a different shade of black on the one fan itself, although they were all made in China and in the same factory. At least they could have thought of this detail during production and mixed the salary into the same colour. I don't want to change one fan countless times to find the same shade of the three. I put it in the back and when they are not together, it is not even visible, but it is a pity. Another problem I have encountered is that the paper parameters look promising, but the reality is completely different. Compared to 8 years old Raijentek 1500rpm, 65.68cfm and 24.53dB they have barely half the airflow and I wouldn't say they have static pressure of 1.8mm/H2O. But what they have extremely low and positive is the noise level. I would say that at full speed they are perhaps less than half as audible as the Raijinteks. I have on the water block 2x Noctua NF-A14 iPPC-2000 PWM, which have many times higher airflow and brutally much higher pressure, so they are heard something between these Raijintek and this Arctic. So the difference between 20dB (this Arctic) and 25dB (Noctua and Raijintek) is definitely tighter than the paper claims. Another thing that bothers me is the A-RGB synchronization if all fans are connected in series on their own cables. If you can cycle the led, they are not synchronized at all, but each one shines differently at the same time. To give you an idea, when I set one colour to effectively rotate, the glowing colour on each fan is in a different place at the same time, although I have them in a row above each other and the rear one is also arranged so that the PWM goes to the right and the A-RGB goes down (from the front view of the case), so they are positioned exactly the same. Or if one imagines a blue-red flashing beacon, each one flashes differently and at different times. I haven't tried to put them on a hub yet, so that each starts at the same time with the same LED, so I can't even confirm if each LED has the same address at the same position as the other fans. But I was expecting that if I plug them in one by one, it will be fixed, so that they all blink at the same time exactly the same as other fans of other brands like the Eurocase ones in my case from the manufacture. But all in all. I have not found any other, affordable and luminous fans. In addition, their noise level, resp. the quietness is extremely high even if they don't blow as I would expect (more). So I kept them anyway, and will keep them unless I come across something that would be more effective at the same noise level. Otherwise I have the Noctui ones stronger for reserve. When I set them to 250rpm, they are not audible at all. When I put them at about 500rpm, they are heard like this Arctic at 1000rpm and so I have set this value and the PC is almost not heard. On the graphics I have also Arctic (90mm) and it is also not heard and I have no HDD (only SSDcka) and the only thing that is heard in the PC is the power supply, where I plan to break the 5-year warranty and replace the original fan with some Noctua, or this Arctic, but not shining, because the power supply is from the bottom of the case.