The keycaps are great, good quality and very nice in my opinion, they also fit perfectly and that's why I'm writing my review, as replacement keys on my Razer Huntsman V2 which I have. Also on the Cooler Master Nvidia GTX edition (a bit old now), the transparency of the keys is just okay.

Very nice keycaps, durable as pbt (compared to abs) and they are useful mainly for rgb keyboards and switches, with which they create a very nice effect.

The transparency of the keys is disappointing, as others have mentioned. All the characters are quite blurry, as if you have lowered the brightness (not that they are not visible, but they don't look nice). I recently bought them for my Logitech g512 with brown switches because I had issues with the original ones, where the keycap attachments had become loose or cracked on several keys.
I should note that it was my own haste and carelessness that caused some of the keycaps from this set to not fit on my keyboard (specifically the spacebar, enter, and \|). I mention this in case someone with the same keyboard is considering buying them.
Other than that, in terms of plastic quality, I am very satisfied. They fit much more tightly than the original ones and don't show fingerprints on them.

Very good keycaps for the buttons, better quality plastic (PBT) and clearly an upgrade compared to the stock glossy (ABS) ones that the HyperX Alloy Origins Core has.
They have a distinct curvature depending on the button, to be more convenient and with a better feeling when typing.
Due to the fact that they are not entirely black, they increase the brightness from the LED lights.
You can find several alternatives for keycaps, but these specific ones are definitely a pretty good upgrade and proposal with not a high cost.

Good feel and touch and quality. Simply, the transparent surface on which the characters are written is disappointing in terms of lighting and, combined with the fact that the light is diffused much more with these keycaps since the bottom part is somewhat transparent, it makes the letters have even less contrast. They didn't blow me away, but they're okay.

The build quality of these is truly top-notch! They are beautiful and unique, and they have a nice texture. The only thing I didn't like is that the Space and Control (left) keys are huge, resulting in them not fitting on many keyboards like mine (Asus Scope NX). There is also a relevant unboxing on YouTube for these specific ones. https://www.youtube.com/watch?v=OPOoFyeRDLM

Quality is good and of course, the keyboard changes how much the lighting is more visible. As for durability, I believe it will be fine.

Well, these are the best keycaps you can get for 25-30 euros! They are very comfortable, they are of high quality and definitely make your keyboard even more beautiful! It's worth every euro.

Good quality, satisfactory sound when pressed, I just believe that they should have added 2 more buttons for this type of keyboards

I put them on a CK61 and the keyboard really changed a loooot.
I've had them for a few months now and they're simply wonderful, both in feel and in everything else. It's worth buying if you get a cheap keyboard like the one I have