I have one of their adapters that replace the CD changer port on the back of my Symphony head unit. I have full Bluetooth streaming, full Bluetooth hands-free phone with external mic, and a USB connection. The only thing it doesn't do is display the song name on the screen, but I can live without that. Easy install and about $200. I hold the phone with an iOttie itap magnetic phone holder that fits into the useless CD slot, since I haven't owned a CD for about 10 years.
I considered the RNS-E but didn't feel like spending $700 for an obsolete nav unit. I also considered an aftermarket head unit but don't feel like they fit well into the D2 interior. I'm really happy with this compromise.
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