if your talking about the alesis AIR FX and the likes i have an air fx..it stinks for dj'ing..alot of teh effects sound the same - theres too much going on in records to use the effects..

i know soemone that used it for production (live and not) and he loved it for that..he advised its a matter of what sounds you run through it -

i havent tried the red alesis sound fx thing..so im not sure about that..

but if you were looking to add to your dj set up i would advise you look elsewhere. (unless if oyu spin very ambient or minimal stuff) .mine has been sitting there all year