Just as you've mentioned.
I've recently bought one of these tablets. First off the OS over them is just borrowed from a phone and does not scale to the screen. The screen is very low DPI with enormous characters. The touchscreen is ultra low response and the product is not robust. The touch sensitive sensor is just behind a transparent film and it easy to crack the sensor.. The battery life is not optimized for the device and even if it is in standby it consumes much energy and the device will deplete it in 2 hours time. There are lots of application incompatibilities. Games can not detect sensors. Programs can not find application paths etc. I also have a Galaxy TAB and these devices are not comparable to a decent tablet like it. They are only good for cheap price but apart from that they are simply "quality free" and useless.
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