I would not buy the NAV just for the consumption screen. That is an added bonus.

The maps are somewhat outdated, but not enough to make me not find my system very usefull for travelling. It's NOT horrible, but it may not be as up to date as some of the stand alone units. Considering the other features it offers besides just the mapping I am glad I was "stuck" with this. It is my first NAV system and I am enjoying the features very much.