It has POI icons all over the map (restaurant, gas station, banks)
Unit is very fast, it can calculate route within seconds.
It has voice commands.
It has Route options to let view precisely how far is the destination before pushing the GO button (distance is by road instead crow flies).
You can create shortcut. In example, if you like McDonalds, you can create an icon on the main screen. When you click the icon, you’ll get nearest McDonalds.
Nuvi 2598LMT has category and saved icons.