The iOS 8.3 update broke almost all external BT GPS devices, forcing me to buy a $300 compatible BT GPS device in the interim, and this 8.4 update supposedly restores that functionality, but I am leary. Once burned, twice shy.
Pilot requires GPS location information for lots of its functionality, including setting Home Point to the transmitter location, so this is a valid concern. My GolfLogix golf club tracking app was completely ruined by the 8.3 update, as it couldn't find me on the course anymore, let alone accurately measure drives and distances to the green.
There is no rollback available, after updating to 8.4, so let's have more early adopters reassure us. So far, the reports are positive.
(Can anyone tell me how to delete my duplicate mislabeled thread created in the P3P Help thread grouping? Thanks!)