Reply to s4 usability

I have an s4 coming next week and i cant wait for it to arrive so i can play it to death.! It'll be the first digital setup I've ever used, previously had Denon 3500s and Behringer DJX750..

This community has highlighted a few different problems that i might encounter with the S4. what are the main problems i will have to overcome (if any) before i play out with it !? any help would be appreciated.!