Only for people who use it who would have gotten by just fine without it. For people like my wife, who lack the gene for direction sense, it's a godsend. For me, don't need it, won't use it - just another distraction, to compete with the plethora of things that already distract us in the car - cell phone, ipod, the Whopper that you are mostly wearing by the time you are done and the inability to find a decent block of music on the radio (hence the ipod).

Heh, the captcha is "quantity"