The Nokia 500 Auto Navigation improves over its predecessor and offers a decent set of features and performance, but the GPS needs some work in terms of ease of use and interface.
The 3M EM500 Ergonomic Mouse requires some adaptation, and it offers only the most basic mouse functionality. But the payoff is a more comfortable mousing experience.
Style and ease of use mark this basic portable navigation and multimedia device, but the Harman Kardon Guide + Play GPS-500 doesn't offer the same smooth performance and efficiency of competing products.
While not as expensive as similar handheld units, the Cobra GPS 500 suffers from a weak receiver and a few design flaws.