Here's a very detailed review of the new ONE XL. There is an interesting routing comparison with Garmin and Magellan on Page 9.
http://www.gpsmagazine.com/2007/06/tomtom_one_xl_review.php?page=1
http://www.gpsmagazine.com/2007/06/tomtom_one_xl_review.php?page=1