After spending most of the evening testing settings and apps I have discovered the following.
1, The default music player app is very limited. It does not show album art, this is a big issue for me. The sound is really awful too (compared to Poweramp) which is another big issue. However, it does automatically play when the unit starts, the only positive so far.
2, Poweramp (my preferred app for music) does not work very well on this unit. If you go into any other app or menu (settings etc) for too long Poweramp will close. Poweramp has settings to keep it playing regardless and I have tried them all. It still closes. This is bad news because Poweramp sounds significantly better than the default music player in terms of sound, but it also displays excellent quality album art and has lots of other customisation. I tried Google Play Music but this has zero audio options and the sound is terrible. It also doesn't play at startup.
3, Widgets don't work on this unit very well. I tried widgets for Dashclock and Poweramp. Both worked initially but then disappeared (became invisible) Tried this on both the stock launcher and Nova.
4, Still cannot find a setting to change to the internal mic for bluetooth or voice commands. Do I have to remove the external first? The external mic doesn't work.
5, I also cannot find the setting to change the door open graphic to show the correct door. I've tried all the options that mention "door".
The positives so far are that the unit is responsive and looks nice, but that's not enough to make me want to keep it. The following is a list of things I need to have working to avoid sending this unit back.
I need poweramp to be stable on this unit (not close down randomly) and play automatically at startup like the default music app. The default app is very poor quality.
I need to be able to change door graphic, so far I cannot.
I need widgets to work properly, most I've tried do not.
I need to able to make good quality phone calls with internal or external mic. My previous unit was brilliant, so far this unit is terrible. I can hear people through the speakers but people can't hear me.