Advantage of high precision piezoelectric photo, above 1440dpi, long head life, almost a year or more; disadvantage is color gray, the purchase cost of the machine is high. Using Epson 2nd generation 3rd generation 4th generation 5th generation nozzle. Head life expectancy of up to 1.5-4 's 20,000 square feet, or higher. Piezoelectric printhead completely controlled by EPSON, prices fluctuate greatly.