Why would Epson replace this stellar model so quickly, with the Epson Stylus Pro 4800? We wonder if the move was strategic. Despite the fact that photographers loved the SP4000, and that Epson's pro printers usually have a pretty long shelf life, it seems the company wanted to hit the street with four new models -- the other three being the SP7800, SP9800, and Stylus Photo 2400 -- that shared the same new technology. This technology is an inkset, UltraChrome K3, that features a third black, dubbed light-light black. Light-light black is a valuable addition, and there's n o doubt that it helps the SP4800 make better-looking prints than its well-regarded predecessor. But there's a down side to the third black, at least with the wide-format models, that might have been addressed had Epson been in less of a hurry. (More about this later.) The company has arguably taken two steps forward and one step back -- but that's still one step forward.