Do these 2 features have a significant hit on battery? Do they update a lot in the background and frequently? I just want to know whether it is worth enabling these features if the cost in battery life is only small.
Cant give you any figures but i've had it turned on from the start since i installed some of the beta versions and not noticed anything major in terms of battery. When you pull down the Notification Centre you will see the GPS arrow pop up for a short while as it updates data on the NC however.