shit, all i know is that my D3 is LEAPS AND BOUNDS better than my N1.. i have ZERO complaints. it led me to a gas station that didnt exist once, and the ipod interface could be better, but it's 10000X better than it was on the N1.. I paid $750 for my N1 on promotion from pioneer when i was an installer and thought that was a smoking deal, after my rebate i got my D3 for $400 and it's far superior than my old N1. Sure, if i had thought about spending over a grand, id have something nicer, but i aint complaining.