The fraxel is a laser developed for fractional laser technology thereby causing less or no downtime than previous technologies. The 1550 is considered noninvasive and helps acne scarring , poreand other scars. The 1927 - dual helps superficial brown spots and melasma. Fraxel repair is a more potent fractionated co2 laser lwith significant downtime good for skin tightening, wrinkles, pore size, etc.