My team has been using KBFS for the past year to share keys and secrets without any issues.
Most of my work on KBSecret so far has been aimed at my own use cases (single user, multiple machine), so I'd love to hear your perspective on KBFS's strengths and weaknesses in your own setup.
The biggest headache is "groups" -> At the moment, a folder is linked to a specific set of users, which is great, but adding and removing users basically requires recreating and resharing the folder from scratch. (We scripted it easy enough, but its not something the KeyBase UI does).