Thanks for finally reviewing these.
As expected, they're nothing particularly special but they are quiet, better than average performers with a below-average price, which is why they're so popular! Simply having them on your charts is more important than the review of these fans themselves, because for many system builders, the P12 has
long been the benchmark against which all other fans must justify themselves. Having them on the charts is far more useful to most people than costly fans from Noctua or BeQuiet. I prefer the non-PST variants as I rarely put more than four into a build and most half-decent motherboards have enough headers without the extra cable spaghetti of daisy-chaining fans together. It doesn't hurt that the non-PST 5-pack is often under £20, too which makes them a mad sub-£4 per fan....
I have a soft spot for a few high-end fans - I'm running Phanteks T-30 myself and have occasionally been asked to build with Noctua NF-A25x12 or Silent Wings Pros, but as nice as those fans are, they really don't offer a significant improvement over the £4 fan for most builds, and using them instead of the P12 5-pack removes a good £100+ from the budget that could go on a faster CPU, GPU, or nicer case (that might even come with some half-decent fans).
The variants with the ring around the fan blades have evidently cured the high-pitched sound-profile issue at lower RPM. These models are the MAX and the A-RGB, which are more expensive than the standard P12/P14, but still pretty hard to beat.
I buy the P12 Max 5-pack whenever it's in stock because they're even better than these 'benchmark' P12s.
The only thing I don't like about the P12 Max is a nit-pick about how their PWM values are extremely non-linear, and the useful RPM range being all compressed into the 10-30% PWM values. Sure, it's very capable at 3000rpm, but I'm interested in the 800-1600rpm range and those P12 Max fans hit 1600rpm at just 30% PWM. At £6 for an amazing fan, it's barely a real complaint, but it's a problem that the regular P12s don't suffer from!