A neighbor of mine just unwrapped his yesterday. Said the case and power connector were very rugged. The manual describes some truck-specific routing options that may be arcane, but would pay off well for a trucker. We spoke generally about the motorcycle-specific routing features (routing being a bugaboo of mine). He will report more, I'm sure.
General review from WebBikeWorld: http://www.webbikeworld.com/gps/worldnav-gps/worldnav-3500-review.htm