Duno if its just me but I mix pretty much purely on headphones anyway, find it much more accurate, not hard at all once you get used to it.
i did a dj comp few weeks ago at a bar in town. when i got there i asked the guy where the monitor speaker was and his reply was ...."errm, there isnt one, there is a bass bin down there".
joker.
it wasn't too big so i survived.