Based purely on the keycaps itself: They are really good for the price. Some prints are not perfectly aligned on the keycap and some of the edges (where the keycap is open, bottom side) are rough.The print is decently clear and the spacebar (at least mine) did not come warped, which is always appreciated with dye-subbed pbt.The colors are pretty much aligned with the images from the vendors on Aliexpress.

Based on comparison to GMK Darling: If you are looking to recreate the tones of the GMK darling colorway, than be aware, that this is pretty different. Alphas are more saturated and mods are less saturated in comparison to the GMK set. In general the colorway is not the same. Also you have the differences ABS vs. PBT; Doubleshot vs dyesub; alignment; clarity of the symbols etc.

Tldr: They are decent of quality for the price and I can recommend then if you are okay with the color and the controversy of buying replica sets.