I’ve bought two. For the price, they’re excellent, but they differ from each other by a few RPM, and one is noisier than the other. So, I suppose they’re cheap, but they’re not 100% identical in terms of build quality.

Purchased (set of 3), to be mounted on the front of the Jonsbo N4 (NAS case), and the drives dropped from 44-47C to 31-33C.
As for durability, Arctic always makes quality products.
An excellent solution for cases where only slim fans fit.

it's worth every euro and the pst simply makes your life much easier as you can connect them all together without needing a fan hub

Just fine, silent and I managed to fit it on the back as an exhaust fan, since due to the combination of case and motherboard, the CPU cable left no space at all for a fan. The screws it came with were fine, unlike other fans from Arctic that came with the wrong screws and gave me trouble. It does daisy chain properly with both the same slim type fan and with the other classic type Arctic fans. In terms of temperatures, in some cases the system is cooler by 1-2 degrees.
In short, it does everything it promises. It fits in places where classic fans can't, it's silent, it connects with other fans to save headers, and it cools (even if just a little).

I give it 3 stars as its air flow is not that good.. at least based on what was said in the reviews, you can easily find fans with better air flow for a little more money, otherwise it doesn't make noise. For anyone with a demanding system who wants to add fans with quite good airflow, it's better to go for another solution. In my case, my system is not that demanding (thankfully) as I don't have a graphics card inside.

Quite good performance for slim fans and relatively quiet at full load of the computer. I got 3 because in the Deepcool CH160 where fans can't fit on the top and bottom of the case, the P12 slim came and solved my problem.

They have been working for over 20 years straight on the front part of the box and I chose them so they wouldn't be visible
EXCELLENT and they have airflow from a small part but they work flawlessly, excellent fans

Very satisfied, it does its job and fits in a space where a standard 120 fan cannot fit. Aris is quiet and has good performance

The money that Arctic plays with its fans makes you feel like a fool when you buy from another company, for 6.5 euros, what can I say, it beats fans that cost 20 and 30

Awesome little fan at a great price that will solve your hands for towers with limited space. The airflow is very good, the performance is comparable to Arctic's conventional thickness fans, and the noise is minimal. I had an issue with fitting it on my Arctic Liquid Freezer II 360 cooling tower as the radiator is bulky and the conventional fans couldn't fit at all. I replaced them with these, the problem was solved, and the performance of the cooler remains at expected levels. Excellent.

You can't not give it a 5/5 for two main reasons. 1. It is quiet or at least with very low noise when it works high up and 2. Its price. If you take into account that it is a more specific solution when fans don't fit, for example 25mm, then it is an excellent choice. The cable that branches out is good, although personally I use a Y-type on the motherboard.