Well, installed GM two days ago. Some improvements that I've noticed so far: - No more music skipping. iPod app would skip occasionally while listening traveling by car (with earplugs) - No more loss of GPS accuracy using Navigon after temporarily switching to another app. Usually it would revert to an error specifying GPS accuracy was less accurate than 47m and never get a more accurate fix unless I killed Navigon and started it again. Very happy with both improvements.