Nextcloud is bloated and slow, but it works and is reliable. I've been running a small instance in a business setting with around 8 daily users for many years. It is rock solid and requires zero maintenance.

But people rarely use the web apps. Instead, it's used more like a NAS with the desktop sync client being the primary interface. Nobody likes the web apps because they're slow. The Windows desktop sync client has a really annoying update process, but other than that is excellent.

I could replace it with a traditional NAS, but the main feature keeping me there is an IMAP authentication plugin. This allows users to sign in with their business email/password. It works so well and makes it so much easier to manage user accounts, revoke access, do password resets, etc.