Hi,
I work with Pioneer units everyday (work in car-audio), the AppRadio on the AVH-8550bt is better with iPhone 5 as it uses HDMI, but is still a bit buggy sometimes, works much better than the older models which was a 50/50 chance of it working....
I put a AVIC into my wifes car as there was not a chance the apps would lock up when she was going somewhere with the nav. For bluetooth streaming is different as the AVIC will give full search ability on an iPhone5 the AVH8550 is just track up and down.
Hope this helps, feel free to PM if you want more info on the App-radio.
MR
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