I installed Seafile and ran it for a while, but what I didn't like is that in order to get to the file on the server, I had to use fuse and, well, I just didn't want to have to do that. Picky, I get it, but we all have preferences.
I've run ownCloud for some time now and I don't see the reliability issues that some people claim. I am running it on TS140 and not something small like a RPi, so maybe that makes the difference.
I've run ownCloud for about half a year to sync my dev files to a hosted server. For a while, everything was great. What happened for me at least was if I was saving a project while ownCloud was syncing, there was a chance of it messing up and then requiring a full resync of my dev folder (a not insignificant amount of data).
The first time it happened I shrugged it off as a fluke. The second time I became gunshy and would disable it any time I was working, then enable it after. Not a big inconvenience but a hassle and something I had to remember. After a while I stopped using it. YMMV, of course.
I've run ownCloud for some time now and I don't see the reliability issues that some people claim. I am running it on TS140 and not something small like a RPi, so maybe that makes the difference.