First of all, by far the best switch I've ever used, but with a couple of caveats.
/u/hbheroinbob is the guy that sells these things, and he basically sells them as a DIY kit, so you gotta put them together yourself which is easy.
Alright, so I stuffed a 75g spring in these things, which are smooth as butter once you get past the bump. Speaking of the bump, it's drastic but feels very nice. It's a "soft" bump, for lack of a better work. I have some Hako Royal tactile switches with a similar spring, and they're much more abrupt.
Now for the negatives, and one of them is based on the type of board I use. On my rev 6 Planck, which uses hotswap sockets, the switches don't sit very snug due to the switch leads being thin. Look at Kailh Pro switches for thicker switch leads. So, they do wiggle a little bit. Secondly, since I have SA caps and these are not box type switches, there's some cap wiggle...but less than other standard switches that I've used.
So, people should definitely check these things out.