I like my garmin Etrex Vista . it be easy to use , seem sturdy and reliable .  major disadvantage : 1 -rrb- the only way to connect this unit to a computer be via a rs232 interface -lrb- old technology -rrb- . I purchase a non-garmin usb-rs232 converter cable but have not be able to make it work ; 2 -rrb- there be no way to connect the unit to a 110 volt source -lrb- read battery -rrb- . I jury rig this by purchase a cable that connect the unit to a car cigarette lighter -lrb- also have a rs232 connection -rrb- and purchase a converter -lrb- $ 5.96 -rrb- that convert 110 to 12 volt with a cigarette lighter output . it work .