It should be working now again, I don't know, but the synchronized entries that get added are a bit less reliable than the ones you manually add I think.
Also the whole thing becomes a bit of an annoyance when orders create multiple shipments.
Partial deliveries and estimated delivery dates are meh. I wish the shipments would split into different items in the main list view.
That being said the synchronization itself is a fantastic concept and I'm glad I can use it.