The Samsung U5 is a fitness-friendly MP3 player with a cute design and an affordable price ($40). With only 2GB of storage and a cramped, 1-inch screen, the U5 isn't suited as a primary MP3 player, but it works great as a second-rung surrogate to spare your iPhone the indignity of being tossed in the gym bag.
A four-line, 1-inch, OLED display is slightly recessed into the middle of the U5, giving it an unfortunate resemblance to a pregnancy test. Despite its small size, the display is relatively bright, with white-on-black lettering and the kind of excellent viewing angles only OLED can accomplish.
Samsung rates the U5's battery life at an impressive 20 hours, which is 6 hours more than you're likely to get from competitors such as the Sansa Clip or Sony B-Series, but not quite as high as the 27 hours boasted by the Philips GoGear Spark.