I've used an s2 for almost 3 years and have had no issues as i play in nightclubs that already have mixers.
Using it for mobile work might not seem so ideal possibly. Main reasons being no EQ in on the s2's mic channel .
I've used Serato since day once SL1 box but if i can go mobile with the S2 then that is what i prefer but i just feel i would want EQ for the mic and extra channels.
Is it Pioneer time like the sx etc etc?