Apple's iPad is the best tablet on the market in terms of consumer satisfaction, according to J.D. Power and Associates' new 2013 U.S. Tablet Satisfaction Study. The survey looked at the opinions of 1,857 tablet owners who've had their devices for less than a year, and Apple's bestselling tablets came out on top for the second time in a row. Apple devices hold the top spots in J.D. Power rankings for both tablets and smartphones.