@coliver I went through all of the drive/sync solutions recently and Sharefile was surprisingly the best. That does not include Nextcloud as I never got around to trying it.
I did try the tool @coliver mentions and a few others, but the lag on my large dataset was too much to deal with.
I do agree the web UI for ODfB is slow and buggy, definitely not something I would prefer to browsing a network drive. The sync was the worst of all tested (Dropbox, Google Drive, etc).
Maybe it will improve with that update in the fall where OneDrive Files on Demand will be integrated in Windows 10.