I just got my n-tec today and I'm getting used to it.... the female voice is nice! Got my iPhone playing music through it and paired it upon Bluetooth but not tried making a call yet. Radio is good and overall I really like it!
Sat Nav's, regardless if its a tom tom or an inbuilt manufacturers, have a few weird things but as you use them, you get to know how yours works and it becomes a very helpful tool.
I have not yet tried a full address in the connect, just a postcode this afternoon to get to a venue. It was ok.
I would think that you should be able to add house number. Maybe those here who have much more experience in this can answer better than myself as I'm a newbie and this is my first day of ownership!