I wrote recently about this in a thread in the audio/interior classifieds section. I have the Dynavin and though I do love how OEM it looks. However in terms of options and features, it is seriously lacking compared to most aftermarket decks from Pioneer/Alpine. The Dynavin ipod interface is terrible which is starting to get on my nerves. To add to it, the Dynavin is more expensive than those aftermarket decks as well.
That being said I knew all this and still bought the Dynavin. Part of me regrets it, then again I would do it again. I just cant stand how tacky most aftermarket decks look. Also from a Nav perspective, I do think the Dynavin has potential as you can load different nav softwares that are compatible with windows CE.