My favorite feature is the automatic recalculation option. I don't know how many times I've had to miss a turn or change my route at a moment's notice. The TomTom doesn't skip a beat, it recalculates the route and continues with verbal instructions. Awesome!
I generally use it to find easier routes through Houston and surrounding areas. My TomTom has actually found faster routes for many of my frequent trips. I wish the extra voices did not cost extra, but more voices please!
-Chris
