Summary: Feb 2010. My Garmin 680 stopped working. The touch screen no longer works. Doing a hard reset does not work. Called customer support, i was told to buy a new map. Now myself, if i have something that is not working, why would i pay for a new map. The old map would work if the touch screen was responding. So as far as i'm concerned, 20 months usage for $400 is not worth it. And in this day and age, to have bad customer support is beyond my understanding.
Summary: My advice is to save your money and not buy the 680. The MSN feature is worthless and unreliable. I live in Minneapolis (where there's supposedly a strong signal) and yet the MSN system has gone "inactive" seven times in the six months I've owned the 680. Each time means a long wait while MSN re-sends the signal, and the inconvenience of not having the feature work.
Summary: After purchasing this unit I took several trips trying to use the GPS to guide me. I will never buy another Garmin unit. For most of my trips, I wouldn't have been able to get there using only my Nuvi. There were several streets that the Nuvi couldn't find, streets that were there for decades. For example it was a nightmare trying to guess the Garmin abreviation for County Trunk V. I tried Cty V, Cty Trk V, V, etc.
Summary: You could not pay me enough to go through what I have with my Nuvi 680. I mainly bought it to help with work commute. The advertised idea of instant traffic reports was highly appealing to me as the commute can be a problem. I paid a lot more for this unit solely because of that capability through MSN direct. I have now had the unit four months and the traffic report has only worked for maybe 10 days. Even when it worked, it was unacceptably slow.