for me the first thing 3 decks does and what i find most valuable is being able to have the next record cued,,,,a lot of tracks that i play r short and sometimes if a mix is a bit long, by the time it is over there may be very little time to get the next record in( i dont mean getting it beatmatched),,,i mean mixing it in a way that i feel keeps the flow and say being able to have the next 2 tracks up for 90 secs as opposed to 30 secs or whatever...so it can enables me to mix shorter tracks longer bec i dont have to worry about spending any time beatmatching the next track...

i would have to feel quite comfortable w/the system to have 3 records up at once when playing out esp when playing really hard tekno....but i would always rather risk failure than not to take a chance but i wouldnt do it when the booth/system would be a sabotaging factor,,,,