"Interesting" is one word for it. "f-ed" is another.
The only good things about 3.01 are the button response, info text readability on the map, and key beep disable.
Otherwise, to quote Capt Kirk... "Cons....!"
-Takes just as long to boot up, if not longer.
-Music during splash screen comes on no quicker than before.
-3D Map moves slower, has less detail, and does not display all street names.
-Map acts funky and weird, sometimes freezing, and requiring multiple pushes of the map button
-Map visual setting does not retain full-screen mode, and the useless information window keeps re-appearing in the lower left quadrant whenever I re-start the system. (I think 2.0 did that, too)
-iPhone was not recognized every time I plugged it in, and when it was, would not play any music. (iPhone 3G sw ver 3.1)
-Howard Stern and Opie/Anthony still suck and aren't funny.
EDIT: Doh! I had reset the unit in an attempt to get the map working correctly, without having to turn the engine off and on again. That reset AV1 to default. That is why I had no audio from my iPhone. It's OK now. (The iPhone playback, that is. The other stuff still sucks.)