Garmin - Nuvi 750 Review

I chose the 750 Garmin because of the screen size.  After a short time I had a problem with the unit - it died when it was plugged into my cig lighter telling me no battery left.....Garmin quickly Fed X'd a new unit.  Then the replacement unit had similar problem and also the voice would have to be re-activated each time I turned the unit on.  Then the voice  stopped working entirely.  Garmin replaced this unit with a 760 Series.  We will see how it goes.  Not giving up on Garmin as the Customer Service is top of the line.  Just hope this solves my problem.