On the way home I tried it in the train. It works fine even inside a vehicle in the night. Though it still looks like a game device, the tracking is really accurate. I heard GARMIN has the best mapping system. Though it is a good device it still has problem acquiring the satellite around tall buildings and even dark stormy sky as most GPS unit do. 
Besides the flat 2D view, it can also display in 3D. Personally I like the 2D view because I have a clearer picture of the things around me. Just like reading a conventional map. Unlike conventional map I can know exactly where I am. If I click on the car icon it will tell me my location in longitude and latitude. In time of emergency it is very useful. If you need to go to a certain location it will direct you there with a voice-prompted directions every step of the way. You can choose the options of the shortest or the fastest route.
The other thing that I like about a GPS unit like this is the Point of Interest tool. It will tell me places nearby like Food, Fuel, Shopping, Bank/ATM, Hospitals and many other POI. No more asking strangers where things are while the place or thing you are looking for is just around the corner.
It also has some handy tools for travellers like Calculator, Currency Converter, Unit Converter and World Clock. It even has a Picture Viewer where you can store photos and show it around. The photos can be transfered by a USB cable. New maps can also be transfered this way.
Here's a demo movie from GARMIN: http://www8.garmin.com/buzz/demos/nuvi200demo.jsp
