I like its large (11.6″ x 15.4″) size and up-to-date information on low clearance locations, road construction and condition hotlines. it also features new roads and Interstate exits.
The 2013 edition (glue binding) is available for $17.96 (a 10% savings off the regular $19.95 cost) at RVbookstore.com
It has the same information as the standard edition, however, the spiral bound and laminated pages are sturdier and take a beating in inclement weather.
With the laminate pages one can use a dry erase marker for notes. I especially like this feature because I frequently outline alternative routes along secondary roads and can just wipe them off with a tissue if we decided on a different route. The spiral spine allows the book to be opened flat to a particular page without splitting the spine or damaging pages.