I have the Pioneer Appradio2 in my car. The firmware hasn't been updated in several years... There are some pretty big user interface issues, such as the track selection buttons moving around in various modes.. They move based on whether you are using the ipod player, or using the ipod music while viewing the GPS screen (using theaudio mixing) for instance. Hard to find on a touch screen while driving... Things like that should always be located in the same place!
The bluetoth connection to my phone failed the day my phone received Android 5.0.2. months ago, still doesn't work. they haven't fixed that. It either fails to connect, or if you can get it to connect, then it will not a 2nd time, without deleting the android pair. If you do get it connected, then it won't transfer the phone calls, or the phone book from the phone.
Pioneer should learn to support a product before developing a new one!