Installed without a problem for me. Lots of both big and small changes. ... I've not tried ownCloud support for my other calendars. Folder support is there but seems a bit rushed with basic transitions, unrecognisable folder icons and a fiddly method of creating folders, especially as I found moving an icon over the folder made the folder jump up a row if it's the first in a row. Room for improvement.
And if you want something else than a red circle, tap on the icon in the folder view