If you are thinking of buying these thinking they'll be a direct replacement for your Logitech G815. The keycaps don't fit. So unless you get replacement key caps that fit these, they are not a direct replacement for any faulty switches on your Logitech keyboard. These cap holes are closer together compared to the switches that come stock on the G815. These switches are a bit louder and have a more nice crisp clicky noise to them also. I like them over stock switches.

They feel nice and I'm bummed they will probably just sit in a drawer now. But I couldn't use them.