[Android Head-Units] OnkelDeffe:
At first: egnlish is not my native tongue, so please forgive me any mistakes in grammar, vocab aso ;)

2nd: I did this tests with the unit on my desktop!

Unpacking: good packaging, different slots for harness adaptors, dvd in-slot drive underneath the screen, lots of ports (2x micro SD + 1x USB at front, 3x USB rear, GPS with fakra (!), ISO harness, 2 harness adaptors for analog audio out, external mic aso

The screen is mounted with 6 miniature screws, better cable than Joying uses - but difficult to mount in car and the port on the tablet is not secured; when connecting the cable you press against the electronic board in the screen - should not be done too often I think

Start up (cold start): after 30 seconds the last source (for testing DAB+ radio) is started automatically, then after 15 seconds bluetooth connection is established and GPS FIX is done (I use an external multi purpose antenna from "Antennentechnik Bad Blankenburg" for analog radio, DAB+ and GPS). For a few seconds the responsibility when touching the screen and starting aps is a little bit slow (loading data in the background I think), but later on it's OK

WiFi is a peace of crap: my fritzbox router stands only 1 meter nearby but I only get speeds about 1 (!) to 30 Mb/s - thats poor! Loading navigation maps is near to impossible ... I installed MapFactor with Tom Tom maps - they have a pc program for map management so you can download the maps on your pc and store them on the gps micro sd card!

Bluetooth is working, internal mic is poor, could not test external mic (is installed in my car - hopefully it will work better). I had to re-pair my cell phone once - don't know why, after that everything worked like expected

GPS is OK when using a good antenna - had a fix immediately after startup. If GPS signal is not strong enough, now fix will happen, even if 20 sats are in view! (Antenna on my desktop near the window - no fix! Antenna outside the window - immediate fix)

DAB+ (external USB receiver) works absolutely OK with the external antenna - the mini antenna for the front window is useless! Needs a few seconds to "lock" the radio station - I had to make a new search one time as no radio station could be locked (about 1 minute for the scan) but then everything worked fine again.

FM radio: absolutely OK with my external antenna. May be worse during driving but here on my desktop it's good enough for me - and I have DAB+ too ;)

DVD: Needs about 10 seconds to read the DVD (or start the app?!) but then everything works ok

External 3G dongle (3GDON008): a peace of crap, whas unable to connect using my constar prepaid SIM, neither on the head unit, nor on my pc. And as it connects to the head unit using the poor inbuild WIFI is won't be as fast as expected ...

Easy connect works with my Sony XPeria Z3 compact at once, a little lag but absolutely OK for me. You can modify the volume level from navigation voice to "normal" sources. You can switch between total mute of other source during navigation voice or mix it - missing the option to lower volume of other source when in mixing mode.

You can adjust the stand by mode up to 2 hours - in standby it needs about 0.4 ampere (5 Watts/hour) otherwise up to 1.5 ampere (18 Wats) when screen brightness is set to full

In factory settings you can enter individual volumes for every source (didn't tried it yet), different CAN BUS protocols, enable button lights, select car logo at startup and many more

If only they had used a better WIFI chip / antenna ... OK, a PX4 instead the PX3 and 2GB Ram would be nice - and a parrot bluetooth module, in build DAB+ with seamless blending and in build 3G module - perhaps in 2017?

The support at xtrons uk web site is - useless. They are friendly and you'll get an answer to your question but they could never give me an answer that realy helped ...

Greetings

Detlev