We have a Garmin 770 and I really like the display and features. I am not very happy with the routes it takes up sometimes. We just came back from a 8 day trip and I sometimes scratched my head on why the Garmin wanted to route us in certain directions that were out of the way. 90 percent of the drive was interstate so there weren't any issues with low bridges or narrow roads. Thank goodness I also used google maps on my phone or several times the Garmin would have had my driving in circles.
I updated the maps right before our trip so the GPS was up to date.