Reply to S4 popping/glitches/fixes( is it worth it?)

Im really interested in buying myself the Traktor Kontrol S4 but ive heard real the good things and some real bad things about the kontrol. ( ex. clipping, dropout, popping nosies for both PC & Mac users, jog wheel not working, channel volume & cross faders not working correctly). Most of those hardware issue were from people that bought there S4 when they first came out.( never buy 1st generation electronics, they always have issues! Hahahha ) The popping and drop off issue is what i hear from a lot of people. My question is what causes the popping and how do you resolve this problem? (If i buy a new separate sound card will that fix the problem?) Any help would be greatly appreciated!