I got mine today and they're awesome. Thank you, Ivan!
I really like the top surface being slightly narrower. Maybe I'm crazy, but it feels like a big difference. Like my fingers don't get snagged on the edges of keys as much as they did with stock Filco keys. The texture also matches the Filco case perfectly. When you look at them from an angle with slight light hitting them, they look like part of the case.
The only con is how tight they are on the stems. You have to put a lot of force to get it on all the way and get it level. Remember not to pull them straight up and off, but to wiggle them back and forth, or you might pull a stem off with the key. Be super careful with the space bar. I forgot to put an o-ring on mine and had to pull it off, and it felt like it was cemented on
. The letter it came with said to maybe use some lube, but that would be a nightmare when it comes time to clean. Lube will attract and buildup the dust, hairs, etc that gets under the keyboard. I think you're better off just letting them wear in over time from pulling them and putting them back on.