When I had a loaner without nav, a few girls all said the interior looked very cheap compared to my e92 with nav. Some love it, some hate it. But, it is more than a navigation system. Having your ipod tracks displayed on the screen and being able to scroll through them is cool enough.
Sometimes at night the nav screen/light is annoying and I just turn it off. It was cool with the e46 nav, the screen would stay black until you hit the accept button.