Reply to Kontrol s4 worth the money?

Hey guys

kinda a newb but heres my question... I'm contemplating getting a controller and have had the opportunity to play around on a few, including my old roommate's s4, which i loved so much ive considered getting one myself!

problem is that its pretty much the ceiling of my price range... $800 is a lot of dough for me to fork out so pretty much im wondering if it is worth it or better off with a s2 or a different controller for the money?

been spinning for approx 2 years, have used traktor for the last 8 months, some experience with controllers (s4, twitch, xone 4d, mixtrack pro, x1, novation launch pad)

*EDIT: now REALLY considering the s2 since the s4 is rather expensive and complicated... however is the dedicated filter nobs missing a real big loss? also whats the deal with the sample decks for channels 3 + 4? still trying to wrap my head around how to use that

cheers in advance