The turn by turn directions work just like a Tom Tom or Garmen unit. I was very happy to see that if you went off the rout, it immediately began to re-route you another direction. This is a great feature if you run into road construction or heavy traffic and make a different turn. The voice lives up to the name Android, but I am sure it will improve with time. I give a 5 star rating. Google just saved me $200 on a GPS device!
Pictured is a Droid running turn by turn navigation