Plenty quiet, but Kailh has made better silents since. Not at 45 cents apice when filling a full-size keyboard, though.

These make a light "swishing" noise during travel, and a light "thud" on bottom-out.

You can mount low-profile caps like GMK on these regardless of their orientation.

These might be my new favorite switch. At first, I thought they were a little too light since my old main keyboard had box blacks on it but after some getting used to they are very comfortable to type on. My only issue is they are so quiet that they make my stabilizer rattle, even more, noticeable since there is no loud clack to them. I have some alright stabilizers and I lubed them to help with the noise but I'm just going to get cherry stabilizers and lube them up to fix it. I was going to do this anyway so there is no issue.