I have been using the Garmin Nuvi 680 for a while now, and I do like it. There are some things that I don't like about it.
- You can't specify a number destinations and have the Nuvi calculate the best route to all of them. You can only specify a destination and a single "via point"
- You can't specify a road to avoid when routing. For example, there is no way for you to specify that you want to avoid a particular highway on your route
- The traffic alerts do not indicate the time that they were last updated. It is impossible for you to determine how likely a alert is to still be a problem.
- The microphone on the unit, when mounted on the dash is near the windshield. So, when it is raining out side, it is hard for the other person on the line to hear you.