I am also very interested in the SyncML support. I currently run Funambol on my home server and find that it's difficult to know what data is where after a few syncs with different clients - not all the clients show all the values and you can't easily see what's in the database. FengOffice will be very appealing if it is the central point for the syncing, rather than just another client, as it will allow us to work directly with that central data.
As implied by my agreement with the comment, "suspiciously affordable", I have had some thoughts about possible complications in the sync system and ideas for potentially-useful features. I'd like to share them with someone involved in the project - how/where can I do that?