Recently purchased the Garmin GPSmap 60CSx and have been using an openstreetmap.org EU map (free, excellent for Europe, NOT routable) and smellybiker's wanderlust maps (for the time being only for the UK, they work but less detail than OSM stuff).
For a trip outside Europe I'm preparing (or in any area where the openstreetmap.org maps are patchy/incomplete) I'll use smellybiker's world maps (yearly membership of ~$50 required). I can send you screenshots of the smellybiker maps if you'd like to get an idea of the level of detail. They seem perfectly adequate to get you from A to B.
As for the unit, even though I like it as a product (design, features), I've already returned it to the factory and had it replaced for a faulty power on/off button, and have subsequently had a freaky incident last week when a waypoint I had captured decided to move a good 20 miles off the mark...
Alex
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