I can't say nobody told me (thanks to Geert), but I was hoping for a normal use of eap replication I won't get into any trouble.
Now I know better.
I just created a replica and worked one day at home in a different package than the other employees. My package is version controlled so nobody could access. That's why I assumed that no conflicts should happen.
Now I know better.
This morning, I synced the DB and I got the cryptic "Resolve Conflicts" window. It told me that in table "package" the GUID "{A34534-343FE-..." has modified. Keep the current value 0 or overwrite by the value 3? :-?
What the f***? How should I know what that means? Just chose the latest value.
After that, one whole sub package I created with lots of requirements COMPLETELY DISAPPEARED! Two other packages I worked on were EMPTY!!! That's the worst case scenario! In both replica and master these packages were lost.

I had to manually import the two empty packages contents from the xml file. I could not manage to recover the one that has disappeared.
The work from one day is lost!

Now I know better.
To other EA users, I can only say this: Don't use replication!
To EA, I can only say this: Remove the feature from EA!
I already read, that its a Jet feature, not an EA, so if you can't provide a reasonable interface to that feature, don't provide it at all!

-Jan