I can NOT function without one. Mine is currently doing a weird beeping thing, with some random electrical wires poking out. Maybe it's due to throwing it across the dashboard of my car. I dunno.
In researching new GPS devices, I came across a special little section called voices. Yes, my friends, this might be worth the 12.95 per voice to get someone you really like to listen to.
A couple of favorites:
"Turn right or I'm gonna beat your head in." "Guide you there, he will."
Dora Explorer and DarthVader might get really annoying.
However, add Matt Damon