First of all, what a pleasure using Garmin Express compared to the old stupid and complicated way of updating maps!
Three strange things tho' when updating your maps & software on new 3597's:
1. Once you have connected the unit to your PC and Express starts up [great] you are then informed that there are updates, you hit the "Install" button and nothing happens, no indication that the "Progarm" is responding, so you tend to hit the "Install" button again, still nothing, then you try to cancell and are warned that this may lead to problems....[which i eventually did, shut it down and reconnected and then it was fine]
2. Then while doing the installation, with the Garmin connected to the PC you still a warning that you must Connect the Unit to the PC.....a little confusing, you are not sure whether you should unplug and reconnect or not, if you happen to glance at the Garmin screen, you will note that it is "Loading Maps", why not a warning saying "Do Not Disconnect"?
3. Then you get a message to say that there has been an "error...try again". when you do, it happily carries on installing....
maybe it is just me, but this happened on two NUvi 3597's....