So I installed these on a Leopold FC980M. The only trouble with the set I've noticed is a standard problem with PBT - the spacebars are not exactly perfectly straight when you lay them on a flat surface, which may cause some binding/rubbing depending on your stabs. Leopold stabs are perfect - so keycap tolerance is what makes a difference. The backspace and spacebar could be closer in tolerance. Note any critique in my posts is to be considered constructive criticism.Attached is the best photo I can do with what I've got. It is difficult to capture the neutral gray color, but this is possibly the most neutral off white I have seen on a keycap. It is not intense white and it is not really gray, and it is not beige... which means it is pretty much perfect because the Leopold it is on has an extremely neutral gray case also. The photo is probably too warm compared to reality. It looks better in person than in this photo: