For the person that gave them a bad review, it's not the switch that they don't work on, it's the height of the stem of the keycaps. 3.0mm o-rings are better suited for tall keycaps like SA profile keycaps. Most other types like OEM, Cherry profile DSA, DCS, etc. will not work well. They are right that 2.5mm is the thickest you can get for some of these other keycap profiles.

These O-rings are too thick for both MX Cherry Silent Reds as well as MX Cherry Browns. They mostly work much better on the browns but a few keys need to be pressed beyond where the contact point happens with the O-ring. i gave them plenty of presses to get them into the "proper" position. They are unusable with the Cherry Silent Reds. I would suggest 2.5mm instead if you want to go for thicker rings