Depending on your RIP, there are quite a few different ways/speeds to run the white ink at. At first we only ran it on some super slow stock profile, but you can change the passes, etc in the RIP settings and it is about twice as slow as a normal print. One head can print the white and the other can print the color overlay, or vice versa. Setting up the artwork can get kinda confusing as to what all is overprint or not, but it isn't that bad once you get it figured out.