I have a similar configuration, a KeePass file synced across my devices with Syncthing and it's pain free. I never think about Syncthing every since I configured it. My only worry is if all devices fail at once, I could lose all my password safe, but that's highly unlikely.
We tried passpack at work for a while to be able to share passwords across a small group of people and it wasn't a great experience, mostly because we always had to manually share everything to everyone in the group.
We moved to Lastpass recently because we can have group passwords. Turns out that you cannot even copy the password without displaying it, which I'm very surprised of.
In comparison, the KeePass would be worst if it comes to sharing between a group, but for a single individual, KeePass + Syncthing is amazing. I don't use any plugin, I just open up KeePass, ctrl + f to find the entry, ctrl + b to copy the username, ctrl + c to copy the password. With those shortcuts, it's quick enough for me.
I'm not overly interested in maintaining my own sync service. I'd happily pay for a hosted version of SyncThing (assuming I could verify it) that I don't have to maintain.
I try to balance convenience with security, without being too zealous about either.
Syncthing runs locally, you don't run a separate server with it (although you can, as another participant in the list of clients). When two clients see each other on a local network, or over the internet when you allow the use of the open discovery servers, they sync data. There is no cloud or central service (beyond the optional use of the global discovery servers).
You don't have to maintain anything beyond setting it up and reconfiguring the clients allowed after reinstalling the OS on a client, and occasionally checking on it and updating the software. It's pretty low maintenance.
We tried passpack at work for a while to be able to share passwords across a small group of people and it wasn't a great experience, mostly because we always had to manually share everything to everyone in the group.
We moved to Lastpass recently because we can have group passwords. Turns out that you cannot even copy the password without displaying it, which I'm very surprised of.
In comparison, the KeePass would be worst if it comes to sharing between a group, but for a single individual, KeePass + Syncthing is amazing. I don't use any plugin, I just open up KeePass, ctrl + f to find the entry, ctrl + b to copy the username, ctrl + c to copy the password. With those shortcuts, it's quick enough for me.