OK, after 4 days of playing w/ ownCloud, I'm convinced it's (1) poorly documented, (2) exceptionally buggy, and (3) definitely not ready for production use.
Of the three, #1 is the biggest issue, IMHO. It used to be that you could find good technical documentation on sites like http://www.tldp.org
The info provided under ownCloud's documentation link is skimpy at best and does not yield a fully-functional implementation.
Case in point...the nginx install guide makes no mention of the client_body_buffer_size parameter. The default value for nginx is 2 * page size - typically 8k or 16k. At least on my system (Raspberry Pi), you can't upload large files w/ the default setting - you have to bump it up to around 128k. Problems w/ uploading large files on ownCloud are all over the net w/ results ranging from "it seems to work" to "never works".
Another bug...if you disable the media app, delete a user, and re-enable the media app - you can't add the same user back b/c there's already an entry for them in the oc_media_users table in owncloud.db Your only recourse is to go into owncloud.db manually w/ sqlite3 and cleanup the mess. Not my idea of fun.
The sync clients are also thoroughly borken, with behavior that ranges from the frustrating to the bizarre.
I realize rants like this aren't very helpful, yet I hope that the dev team takes a hard look at the priority of their backlog...it's nice to be able to play music and upload your contacts, but what would really be nice is ultra-reliable file sync and clear installation guides, don't ya think?
Back to Dropbox....for now.