On the great event openSUSE Conference that happened these days, I was playing around building an AppImage for the ownCloud Desktop client with the great help of Adrian (Open Buildservice Guru) and Simon Peter (AppImage).
The big benefit is that appimage make building and deployment easy. Users just have to download one single file, make that executable and run it, (almost) regardless which Linux they use. Exactly what ownCloud needs.
The results so far are already promising: You can download the ownCloud Client AppImage and see if it works for you! I tested it on openSUSE Tumbleweed and Mint 17 and it works nicely.
Let us know if it works for you!