Well, I have the Pioneer AVH-X4800BS and I the Galaxy Note 5. I'm investigating this as we speak. My head unit does not support Mirrorlink but I'm trying to get the Appradio One working. I will update here as to what I find out.
EDIT: So I found the Appradio page at Pioneer's website and it has the compatible head units. There is a big controversy about the cable that you should use. Pioneer has the CD-MU200 cable but it also says or the cable that came with your phone. Check out the sight here
Appradio One