HOW IT WORKS This ceramic-plated tool has a built-in reservoir of conditioner that's deposited onto your hair as you iron it, so strands are repaired as you straighten your hair. THE EXPERT SAYS "The conditioner leaves locks silky, but it lasts only till your next shampoo," says L.A stylist Neil George, who suggests a salon keratin treatment instead ($150-$500, depending on hair texture and length). If you're looking for long-term improvement, "The keratin lasts six weeks," he says. OUR VERDICT Staffers with thick, damaged hair raved about this iron. "It turned my fried hair into silk!" said one. But those with fine hair had limper reactions. "It made my hair glossy but flat."