I used OwnCloud for a while and never had any problems with it, but it seemed like overkill for my use. I didn't have multiple users and I wasn't using it to share files with anyone -- just syncing files between my own devices.

I started using Sandstorm[0] for my personal server, and there's an app for it called Davros[1], which implements the OwnCloud protocol. It doesn't really do a good job of advertising that fact (not even mentioned in its description), but you can use the OwnCloud clients with Davros. It's been satisfying my file-syncing needs with no problems. Just be aware that it lacks versioning.

I'm excited to see what's coming for NextCloud, though.

[0] https://sandstorm.io [1] https://apps.sandstorm.io/app/8aspz4sfjnp8u89000mh2v1xrdyx97...