I have a customer running CMYK+W and he is loving it. The only issue I see is that you basically lose 2 print head channels setting it up that way. The magenta and cyan channels on the white head never get used during printing. After we set it up for the customer we thought, "Why didn't we just add the Light Cyan and Magenta so that those channels are at least used for something?" It wouldn't speed the printer up at all and I have never seen the difference between regular cyan and light cyan but at least those channels would be used. In the end I don't think it's a huge deal but next time my customer wants CMYK+W I think I'll add the LC and LM.