You have drums of a single colour. Black, red, blue etc. In theory you can run it through on one and then another but you won't.
The dpi is not up to doing detailed pictures either. Having said that my stats prove the end result of a tested leaflet in B/W knocks the socks of a crap glossy leaflet anyday.
I think they are brilliant when you are getting going but most people get rich and lazy on them eventually and sell them on. eh Paul. LOL