Im gona have to talk here, The s4 isn't really made for beat matching (e.g. the tiny faders and the position of the jog wheels) Personally, I don't mind if they use it, as long as they CAN beatmatch normally, it doesn't matter to me. GTFO, just get out if you even consider using the sync button then you are not a DJ, if you use sync you might as well be running nightlife... if its hard to beatmatch on then maybe it shouldnt be a DJ controller from my little experience, its a rapidly changing scene. there are alot of shit djs out there who dont even beatmatch, i would prefer them use the sync button than to have the crappy overlapped songs i hear sometimes. the issue for me begins when people are auto cueing, may aswell record a cd, press play and walk away for an hour. syncing i dont see a problem with.