Horrible...Would 'work' for 1-2 hours before saying there was an error...wasted all afternoon trying to repeat, before continuing without copying anything...but, my data was there...7 duplicates of every contact...apparently I had tried 8 times before giving up...It DID copy all my contacts & camera roll...odd. Ended up wiping the new iPhone & doing the transfer 1 more time...gave me error, but new iPhone only had 1 copy of each contact...Did not transfer my settings, wallpaper, ringtones etc.