for maxis hotlink i can CONFIRMED below is what happen during the a-gps:

1. every single success 3G internet connection will be charge 2 sens
2. every a-gps fix will need 3kb-8kb of data transfer (i not sure why but this is the range i've been observe)
3. if u lost satelite signal during traveling (under the tree, lots of building, or kling klang) the gps apps will accuired again for a-gps data.
4. so u better disable the a-gps once u get the fix (no point to download anymore data if the satelite signal just lost in between because those data wont do any good for u to get back the location fix, not sure why those gps software soo dumb)
5. if calculated then it mean any gps startup and a-gps location fix will cost u 5sens - 10sens PER FIX...