EK's strategy to have different RGB fans has made sense to me finally! Those who want the extra bling with the cut in performance can opt for the EK-Quantum Impulse fans whereas others, including those who purchase EK RGB AIO coolers, will find the EK-Loop Fan FPT series more to their preference. The good news is performance doesn't carry as much of a cost hike as RGB does these days so you will find these fans selling for ~$20 on a good day even outside of sales if you look hard enough. A lot of people have also purchased the EK AIO coolers and are also unaware these fans are legitimately good enough as radiator fans to the point where I have seen many selling them after having bought more expensive fans instead. They would do better to just keep the stock fans and call it a day, but if you chance upon such a listing then go for it!
The EK-Loop Fan FPT 120 D-RGB is a mouthful to say and type and thankfully can back up the words too. It's one of the rare RGB fans on the market rated for higher fan speeds allowing people to choose just how fast these will spin, and thus just how much air will be pushed through with associated noise. They go down to near inaudible levels too and the lack of bearing noise helps further. This results in a long and linear RPM response which, coupled with minimal sample variation, means it's very easy to set up fan curves too. Performance is plenty decent on a radiator as well given minimal RGB penalty on the blade and the hybrid rotor design worked better than expected. It might not be as good as the flagship non-RGB static pressure fans we've seen, especially if you are using a radiator with more airflow restriction than the one I do, but I dare say the vast majority of readers will be fine. Indeed, this is achieved without sounding like a leaf blower inside the case and there are also nine individually addressable RGB LEDs in the middle as opposed to the usual four. This is a good balance of performance and aesthetics and having two color options is also nice. I'm happy to recommend these fans thus.