Here is some more information provided from iDatalink about features not available on Pioneer NEX units:
Please note that idatalink compatible Pioneer radios do not support all idatalink features, such as: • No support digital fading of premium amps. Digital amplifiers can be found in some Chrysler, VW, Ford with Sony, and GM vehicles with Centerpoint Bose • No support for OEM Bluetooth Streaming. - You can pair with the OEM Bluetooth, but should then change the settings of the pairing to be only hands free profile for phone calls. - You should then pair with the Pioneer Bluetooth, but