badz is right. there's no app integration with Android on the 4400. I've got a Galaxy Nexus and streaming Google Music is great, and all phone functions are great, but no Apps.
If you're stuck on the idea of using Android apps with a Pio double din....you should check out the Appradio2
But even with that, I think it may be a pain in the ass for early adopters.
I prefer my nav to stay on my phone screen and not my H/U since i only glance at the directions and don't use the audio and rarely use Pandora.
for me it's the 4400 ftmfw!