Alpine do have a great OEM factory GPS solution, it is to bad that there aftermarket PND does not have the same features.
I do find with the OEM GPS system including the Alpine that is installed in the Honda, Accura, Mercedes etc will not allow you to route in areas that are not verified and test driven by NavTeq.
This is a big issue since aftermarket PND will allow you route in rual area that has not been confirmed by NavTeq, you maybe a block off but you will get to your destination. The OEM units does not allow this option which means if you are routing in Clearlake California, you have to bring a paper map or an aftermarket GPS.