I MEAN lol ... that varela vs duran (on serial killer) doesn't sound like a 4 deck mix in the least (3 at most and only at parts). Varela can swing 4. i'm not doubting it.. he's always best on 3 though. I still have this set from universal madrid which is pretty much flawless 3 decks the whole time. rates as one of the best i've seen.