I looked at a lot of key caps and was very hesitant about buying this set as there wasn't any reviews on it. I am basing the quality and feel of these keys in comparison to my Logitech G915 OEM keycaps, Tesoro Slim Keyboard OEM keycaps, and Keychron K4 OEM keycaps.
Keyboard I installed these on: Keychron K4 v2
Quality: 10/10
These felt amazing, especially since they are textured and you do not see any sort of shine. They are sturdy and I did not see any manufacturing defects on any of the keys.
Fitment: 10/10
These fit perfectly, are not wobbly, and should not have an issue with getting them on or taking them off.
Novelty Keys: 10/10
The quality of the novelty keys were great, they had crisp images and did looked exactly like in the stock images.
Sound: 10/10
These actually made a difference on my keyboard. I currently have brown switches and the OEM keys for the K4 had a higher pitch bottoming out sound. These however dampened that sound and made it sound a bit more premium.
If you are looking for a fresh look for your K4 and are eyeing these, go for it. I have had countless people ask about my keyboard at work. These are people who no next to nothing about the custom keyboard world. So if you want something that is a slight conversation starter at your boring office/desk job, these keys will definitely do it.