CNET have published a review of the Harman Kardon GPS-500 "convergence" device which combines a portable navigation unit with an MP3 Player. 'Much like the company's other products, the Harman Kardon Guide + Play GPS-500 is a stylish piece of technology. It's sleek (4.6 inches wide by 3 inches high by 0.8 inch deep and weighing 7 ounces) and attractive, with a classic silver-and-black finish. The compact size will allow for easy portability between cars, and the unit comes packaged with a simple and secure vehicle mount.
The main attraction of the GPS-500 is its wide-screen 4-inch WQVGA display. The touch screen is responsive and features a 480x272-pixel resolution, so we enjoyed extrasharp text and maps. The screen washed out slightly in direct sunlight, but we readjusted the viewing angle and had no problems seeing the map. Overall, the menus and interface are intuitive and user-friendly. We were slightly confused as to how to get back to the main menu page once we were in a specific function, but we figured out that tapping the Source button performs that task.'
Read: Harman Kardon Guide Play GPS-500 - CNET