Installed on Logitech G513 keyboard. The keys take a noticably shorter distance to bottom out, and the sound of the impact when the key bottoms out is noticably deadened. I added 2 on the space bar (actually 6, since the space bar has 3 places where these should go), which quieted it down much more than just one each. The backspace and shift keys also needed two each to deaden the sounds. I don't think this takes away anything from the keyboard other than a bit of noise, and shortening the throw a bit. The ping at the top of the key, like when you drag your finger off of the Del key, still makes the same noise, but that's expected. I use this keyboard in my office, and it makes a big difference in the noise I make when typing. Took about 1 month to get to Canada.
All is good with this product. Installed in keychron k6 (with original keycaps) to dampen noise a little bit. Shipping took very long time, almost 3 months, but I was not in hurry. In hurry better buy locally.