Battery life
Everyone moans about battery life when using the GPS, it's the backlight that kills the battery not the GPS. Leave the backlight on full blast on any phone and it will discharge fast.
Use the option to dim the display between instructions, it lasts for ages then.
I have a Tomtom one v3 as well as a 6110, the Tomtom has 2 hours battery life, so I don't see the point about battery life being poor on this?