I recently received a Garmin Colorado 400t and I have not stopped using it since I received it.
This unit is both great for turn by turn directions on the road as well as being a great unit to carry into the back country. The Colorado 400t comes with the topographical map of the United States already on the system so it's ready to go out of the box.
I have recently been using the Colorado for Geocaching. It is incredibly accurate and has provided my son and I with a lot of fun searching for buried treasures!
I have hiked with it in Wyoming and Montana and find the optional Garmin trail maps to be very accurate and useful. There is honestly nothing about this unit that I would change. All the features are useful, intuitive to use and incredibly fun.
-Mark
