In comparison, besides the addions of XM radio and a few more points of intrests...are there any more differences between these two?

I'm gonna copp the the new AVN when it comes, but I had a chance to play with the 6620 in a friends car. I can get a 5510 for less than the 6620.

I just want to make sure the audio adjustments and speed were the same.

Thanks.

 

The 6620 will have two dvd drives so you can play a movie at the same time as running navigation. The 5510/5520 only has one dvd drive, the 2nd drive is cd only, so its either movie or navigation, not both.

 

bump, damn, did not know that one, any others?