I moved to the Note 3 from the iPhone 4. I just got my Note 3 a couple of days ago, and it's been HELL trying to get simple sync of music, videos, photos, ebooks, etc done. I've been trying with Kies, iSyncr, doubleTwist, and they all keep running into problems, and then photos would disappear off the Note 3 after I copied them from the computer to the external SD card. They showed up fine a day, then the next day they started disappearing, showing a placeholder thumbnail for the photos.
doubleTwist for some reason cannot syn photos--it does not show the option for uploading photos to the Note 3 for me. Kies does sync, but it cannot sync to the external SD card, nor can it keep the photos in the original directory/folder structure--it just dumps all the photos from various folders into the camera folder on the Note 3 and creates a big mess.
Say what you want about Apple, at least they make their products very easy to use.
I hope I get out of this "learning a new platform" hell soon. Any suggestions for painless, smooth syncing would be much appreciated.