@Aschwin-Nijssen I have a Garmin Zumo XT, Zumo 340, Zumo 390, A BMW Nav IV and My First Garmin Satnav from 20 years ago a Streetpilot 2610.
The Zumo XT was the first Garmin Satnav that had me thinking about junking a dedicated Satnav, hence why I'm here. There are two BIG issues with the XT its routing logic for "faster time" means "Main Roads" even if this takes you out of your way and into traffic which is very different routing behaviour than the older units. Then for imported routes it displays a repeated U turn or RUT problem. I nearly got to the stage of throwing the unit over a hedge until I discovered these issues and get around them as follows. I start an imported route then save it as an "Active route" it then becomes a saved route rather than an "imported route"(you can do this in your hotel home etc) this gets over the RUT issue. When I plan my routes in MRA or basecamp. (Yes I'm a person who still likes basecamp) I start my routes about a Kilometer from where I am. This gives the unit time to find satellites etc and prevents it from trying to take you back to the start. When I'm plotting routes I use more Waypoints and shaping points (Garmin speak) or Via points and Waypoints (MRA Speak) than I would have done with my old units, and finally I display the track of the route underneath the route (I use a custom theme so that the track is slightly wider) so that I can identify if the XT is deviating from the intended route. I also use prompted recalculation rather than automatic (The older units faithfully reproduced the basecamp routes as I think the profile logic in Basecamp is identical to the older units)
When I use MRA for routing I use GPX 1.1 format as this lets me easily see where i have placed my waypoints and via points on the screen(MAP). If you use GPX 1.2 you only see the route and the via points.
All that said now that I know the issues with the XT and the workarounds I'm very happy with it.
Oh and never ever connect the XT to garmin explore.....just don't 