i've got the denon DNHC1000S (https://www.storedj.com.au/products/DEN-DNHC1000S) to use with serato and love it! as for the cdjs with serato when in absolute ur loop in/out buttons work, hot cue, play/pause, cue etc just like using a cd but u dont get the waveform display off the track or the bpm read out.if you use the cdj in relative mode your cue button will not bring the song back to the start it will just work like your pressing play then pause, thus meaning you would either scratch your song in like vinyl or just hit play at the correct time.the hot cue and loop functions also are lost in this mode. also check out this link for the basic run down http://serato.com/forum/discussion/242276