Do Sygic offer updates? I don't know but i'm sure they will like any other app you install.
Do Sygic rely on the AGPS as the OVI Maps do? Yes (It was really fast in finding my position)
Annoying connection dialogs? None.

check out my full review of the application on my blog
http://maemoreviews.blogspot.com/201...okia-n900.html