This isn't a bad tablet, its just not a great tablet.
The build quality is very good, so to are the screen and speakers (although not quite Pipo M2/M3 quality).
The bench marks are ok but not spectacular - but I will admit I was hoping for some winning scores from the CPU at least.
Flashing to the new 1.58 firmware was simple, probably one of the most simple processes I have come across from stock as it doesn't require any software "tools" to be installed on your pc - just download, extract to SD card and follow the rest of the flash instructions.
But there are simply too many niggling problems that let it down:
It refuses to connect to my PC as a USB device and insists on connecting as a "media" player device. This would be ok except it doesn't like you moving, certain types, of files onto the tablet - with a warning prompt about compatibility appearing every single time. You do have the option of changing the USB detection to "camera" mode for pictures and such but in all honesty, so what........
I also had some issues with the format/formatting of the mSDcard. Despite having just flashed the firmware and simply copying the movies over onto the same mSDcard it would not recognise the "avi" files - a couple of attempts/formats later it finally resolved itself.
There are too many, fairly standard, apps that are not compatible with the tablet from stock - like the benchmark apps i use - and it is missing some basic apps, like the stock movie player which is M.I.A.
When i tried to use MX "movie" player there was no sound - i did sort it quite easily by telling MX to NOT use h/w encoding. But every time i tried a new movie the same problem occurred - i could not find the option to turn this off in settings by default.
During my battery test - where i play a movie until tablet runs flat - when it hit 7% battery left i got the usual prompt "warning me about low battery", fine you say - that is until it popped up again and again and again and again......... (I am not exaggerating it must have warned me 20 or 30 times before it finally ran out of juice).
Finally the battery life just isn't good enough, giving just 3 hours of continuous playback where with the RK3066 tablets you can expect 3.5-4hrs, 5hours with Pipo's M2 WiFi.edit - i usually use the stock player, so this may be a little misrepresented versus my other tests
Whether any, some or all of these issues can be resolved with subsequent firmware updates I don't know. Certainly a custom rom will sort out some of the Google Play compatibility issues but i suspect that by the time all these issues are as resolved, as they are going to get resolved, we will be moving onto other, new, CPU/GPU combinations.
My advice is don't buy this tablet, get yourself an RK3066 tablet. If you absolutely MUST have a Quad Core CPU tablet wait for the Samsung Exynos 4412, Tegra 3 (in 9.7/10.1") or one of the others to hit the market.