I just got my S4 a couple of weeks ago and have really been fighting to get it to sync to my computer and download my music and videos. I downloaded Kies to try it and it has not been working very good. I have had all kinds of problems with it making multiple copies of my songs and videos to taking hours to sync. I have had to go back through my music and movies and delete the extra copies it put there. When I do try to sync the phone it will get to 100% on the music and stay there for 30 minutes or so before advancing and it gets stuck like that several times before finishing. So what program is everybody using to sync their S4 with. That seems to me the biggest problem so far with switching from the Iphone to this S4, otherwise I love the phone.