It looks like discussion on portable auto nav system is not very active on this thread. I am interested in getting one and I'm doing research. I was hoping to get some personal experiences from users on this thread. I have narrowed my choices down to three manufacturers - Garmin, Tom Tom and Magellan, but will like to get feedback from other users. I don't need anything complicated, but just key features like text to speech and very good routing engine. Any suggestions on where to do further research or personal experiences of any of the above named manufacturers would be appreciated.