My XT just arrived.
The screen is a big improvement. I have a Drivesmart 61 since they were released. I was dreaming of having a Zumo with as nice a screen as that, glass and high res with a large footprint. The XT delivered, at least on two counts, very pleased.
I usually use tracks when riding, so for me visibility of the thin black or blue line without confusion is the most important, so I usually edit the default themes to lighten all dark colours so the track line is clear. This practice from the 595 works well with the XT, except for one thing: naming. I modified the original Garmin theme and named it Garmin-mod.kmtf The XT listed it in alphabetical order (a plus, opposed to end of list on the 595), but displays it as GARMIN (all caps) I will try "_" next time instead of "-" to see if that makes a difference or not.
It's a lot quicker than the 595 to show up in Windows Explorer in USB mode.
Another weird bit: updating through WiFi shows everything up to date, but connecting up to Garmin Express came up with a speed camera (cyclops) file update. The 61 does this as well, so I think WiFi updates will be ignored from now on in favour of Express.
One negative over the 595 is that you cannot individually enable/disable tracks to show on the map. You can only change the colours of the tracks. All tracks present in the GPX folder will show on the map.
Will see what else the two weekend rides I got planned brings up on the XT.