I am set to Location On as well.
GPS functionality only works with this setting for any and all Apps with GPS features.
The trade-off is a slight battery drain for most.
If I want to use Poynt, Maps, etc, I don't want to go through 5 extra steps and have to wait longer...
Posted from my CrackBerry at wapforums.crackberry.com
I am not a power user.... but if GPS apps are closed when not in use I have seen no change in battery life. Only my weather app on and battery lasts 2 days.