i'm using it at work to take notes and write documentation.
i think it's a fantastic app.
i have it as a pwa and have at least one silverbullet for each desktop.
i have ~100 notes perfectly organized in silverbullet!
the only things i would change is compatability with other tools. there is no way to export to PDF, if you nees to convert the note to docx you need to copy paste everything.
i have been running the new owncloud (ocis) and, with some quirks and very basic functionality, it's been running for 2+ years and survived multiple updates without major complications
i like to have them separated by service, i have 3/4 dbs running, at least 2 of them are postgreSQL.