[Android Head-Units] Croak:
The Atoto is one of the few that uses a MediaTek SoC instead of a Rockchip or Intel Sofia. That means for right now, there's no community support.

I've got the 2gb touch-only version, had it since just before Christmas. It's reasonably responsive (think 2012-2013 high-end tablet/phone responsive), it gets really bright (I'm in Florida with a sunroof and non-tinted windows, never had a problem seeing the screen), colors are a bit muted but viewing angles are good. 2 second boot is true, it comes alive very fast, backup camera activates quickly.

Dual BT was the main selling point for me, and it works as advertised, phone is paired for phone/contacts/media, OBD2 is paired, and phone is can paired again for BT tethering. BT tethering works decent, there's plenty of bandwidth for running Maps/Waze while streaming Spotify, but you'll of course want to switch back to WiFi tethering/hotspot for video streaming or even installing apps from the Play Store.

The microSD card slot works well, I've use a NTFS formatted 128gb SanDisk with no issues. The "fast charge" USB connector puts out just under 2a, so it does charge quicker than most, but still no comparison to an QC 2, 3, or Power Delivery charger. That same USB port is the only USB 2.0 port, the other two USB ports (on one dongle) are USB 1.1

The combination of on-device and external microphones seems to work well enough for voice activation and calling (my callers say I sound fine, no worse than any other speakerphone). Google Assistant does NOT work on this device (or just about any tablet for that matter), but Google Now/Voice Search does work, along with OK Google voice detection. (and OK Waze detection if you're Wazing).

I've only had one crash, and that may have been a launcher problem, or a Spotify problem as much as an Atoto problem.

Audio quality is good, with a half-decent EQ, fader/balance controls, loudness. Power is lacking, so you'll want to run this through an amp.

Steering wheel interface works (though I needed both a PAC CANBUS harness/box, and at PAC SW-1 RC to make them work). Pro-tip if you go with the PAC stuff, program the SW-1 as a Pioneer, and then use the Kenwood wire (instead of the 3.5mm plug) to Key + on the A6. There's also no provision on the A6 for dual button mapping, you get one function per button (some units allow for double press or long press for more options).

Wifi reception is solid, the included remote antenna is the key to this (mine is mounted on the edge of my windshield, partially tucked under the headliner, and practically invisible.

GPS reception is also very good, I almost always get 10+ satellites and quick locks.

So far, so good.

But...the A6 has three big problems.

The first is that the distance between the outer glass screen with the touch layer, and the actual LCD is pretty wide, and that causes parallax issues, where you touch on the glass doesn't match up with the screen, especially annoying with small buttons and hamburger menus. The physical button version doesn't seem to have this issue, because the touch screen and the LCD are closer (at the cost of having the whole display inset and not flush.). If I had to do it over, I'd opt for the PB model.

The second issue is that there's always some electronic noise heard when the unit is powered up, similar to putting a mobile phone next to speakers, and it varies with CPU load and Wifi activity. You don't notice it when music is playing but if there's a pause (or you pause), there it is again. Doesn't seem to be affected by volume settings though.

The last major issue (and there's maybe a fix coming for this in the next firmware update from Atoto) is that when the device has been off for more than oh, ten minutes, when it comes back on, it automatically loads the AM/FM tuner and plays. Which is annoying enough on its own (the FM tuner app is hideous, for one thing), but for some reason, the volume from the tuner is 2x the volume of MP3, internet streaming, or BT streaming music, so if you were rocking out even just a little when you parked the car, when you get back, your eardrums will be bleeding from the FM blast. So far, nobody has figured a way to disable the FM app, it's part of the system, and tied to the MCU.

Overall, I'm not unhappy with the A6, since I went into it knowing that all the Chindroid head units are flawed...but for $179 (Lightning deal), I figured it was worth the risk.