i own the QK75 and it was a little tricky getting some of the keys with the correct size. The left shit with 1.25u was not created and the windows as well. Regardless, this is probably my favorite
The keycaps themselves are pretty good quality, your standard GMK affair.
The weakness is the packaging as for all GMK sets. The paper box is extremely week and the keycaps can fall out so easily once the plastic wrap is removed