I have had Garmin, Tom Tom, Sony and Magellan GPS's over the last ten years. I have come back to Garmin for my last two because they have by far the best interface. My other Garmin is a 1690.
The maps that came with this GPS are up to date. A restaurant that opened within the last six months is on the list.
I have found the 4.3 inch screen size to be the optimal size. It has a nice size keyboard and amazing graphics. It feels 'right' on a car dashboard.
The two features I absolutely require are the speed limit on the screen and the lane guidance. This GPS has both. This is my first Garmin out of three that goes into a split screen mode and shows the interstate signage as you come upon an exit you will be taking on your route. Great feature!
The audio is crisp and clear. It has plenty of volume capacity.
When needed, this unit will recalculate the directions quickly. I should also mention that it is very quick to acquire the satellites.
The one thing that this GPS does not have is traffic. My last four GPS's have had traffic and I have found it to be of limited usefulness. More than 50% of the time, the traffic has cleared out and you are still being alerted. The alternate routes around the traffic jams tend to be somewhat dubious.
Finally, what a great price!!! Just a year ago, you would have paid double the price for a GPS with all of the features you get with the Garmin 40. It is an excellent buy!