I like Trip Planner
Initially I had problems with it but now I actually use it quite successfully for Business (deliveries) and Vacation.
Here are My Secrets.
Place Waypoints at the Places You want to actually STOP (deliveries) (stop at a particular restaurant for Lunch)
If you want to use a Waypoint as a SHAPING POINT place it at least 300 meters before or after the intersection or Roundabout.
This practice will give the trip planner the necessary time to calculate the next leg of the route.
Download ONLY Waypoints to the Nuvi but create the Trip on the Nuvi. Both Mapsource and Basecamp will give you unpredictable results.