i am bidding on a dj1000. does anybody use one these. does the fader bleed like the 2000? also can u still buy replacement faders for it?

so i just got my mixer. i have question; master vs. booth output!
which one is safer for my radio. is there any real difference? also, if i chained one out to my 404 and ran it back in to the mixer would this be like askin for feedback/squelching, or is there a safe way to do this? any help is appreciated.
there is no efx out.