If you use the sync services it will give you the directions on the information window as well.
Overall, it's really a personal choice. I think that smartphone and IPad's offer more choices in navigation options then the Nav unit.
Even though you sacrifice some of the convience of voice commands, I haven't found it that hard yet. Overall, if I'm going somewhere I put in the address before I start driving so don't really need to talk to my car. I tend to use the voice commands for pretty much everything else (calling people, climate control, etc...).
Good luck with your choices!