My mom has a M35 with the Navi system... WOW! And the voice command system is so amazing... I say "106.7" or "105.9" and it tunes the radio. It understand EVERYTHING I say no matter how screwed up I say it. My friends didn't have so much luck, but I don't really care if it works for them as long as it works for me.
The navi is VERY cool, though. Fast, accurate, and if it's got the traffic nav, unbeatable (accept by my Nokia N95 8GB. The navi system on that is just unbelievable.)
I'm definitely getting Navi on mine.
