I have a 2007 TCH and a 2005 Sienna both with Nav. The sienna has the 4.1 version and the TCH the 6.1. I went to my dealer and asked to look at the 2008 TCH with NAV 7.1 and in muy opinion, other than the removal of the I agree screen, my versionin the Sienna is the better of the three version because I can at least over ride it. We got our sona TomTom 720 for his Matrix and it far superior in accuracy. Although the 3-D features are nice, I would prefer accuracy and human input of inofrmation while driving. This was at a considerable lower cost than the factory systems. My neighbor has a new Ford Taurus with Nav that uses the Navteq maps and his system is more accurate on local roads here int he Central KY area and with locating his house. My TCH gets me to within 150 yards of the house.

Not that it will do any good, but I will be writing to Toyota to express my opinion of their policy regarding the quality of the navigation systems.