Actual version is 1.63 (via F-Droid), works quit well. Some small problems with calendars (access rights to other ressources, contacts are losing some informations like the phone type).
So far I had better results with f-droid than the caldav sync adapter. I have a Horde backend system and the sync adapter detects all shared calenders and also synchronized for some time, but it displays no entries in the calendar.
cool! dmfs carddav syncs also photo contacts, and owncloud supports them, and also SOGo Connector on Thunderbird! I've added photo to contacts on the phone, founded them on owncloud contact app and in Thunderbird address book
Couldn't get it configured with my Horde Groupware. It tries to find the paths and configuration automatically, but that seems to fail all the time for me.