It was fairly good at quickly finding the best route.
We purchased one that lasted three weeks and died -- went dead and would not come back on. We replaced that unit and the second died, just as the first. These were not refurbished -- they were new.
The Garmin Nuvi 1300T may be well-rated, but our experience was terrible. It functioned satisfactorily, but two units becoming unusable within three weeks of purchase speaks to bad quality control.