I am using companionlink 5.5036
Deja office latest version
Act 2012
syncing act through google.

So if I create an appointment in Act and sync it shows up on my android tablet and phone's native calendar. In deja office some make it some don't.

If I create an appointment on phone using dejaoffice. It will sync with google and therefore shows up in act and dejaoffice on the phone but not on android tablet. But it is on native calendar on tablet.
If I create an appointment on tablet using dejaoffice. It will sync with google and act and dejaoffice on tablet but not on phone. But it is on native calendar on phone.

Not too reliable so far. all calenders are not synced the same therefore I need to check both phone and tablet to make sure I don't miss an appointment...

Also If I delete an appointment from act it deletes in both androids native calendars but stay in dejaoffice.

so far not too impressed
The only reason I decided to use this product is it is the only thing I found which you can create an appointment and it will link to contact in act.