For example, the starting firmware on the devices is rather raw, and they need to be reinstalled to fresh in order to achieve greater performance
: D You forgot to indicate that this is only your IMHO.
In my opinion - this is complete nonsense and the official stock firmware is great. No failure, glitch, freeze.
My HeroII came with android version 4.1.1, kernel version 3.4.0+, build number 2012.12.28 V1
Of the minuses seen - IMHO can not work on the network, because The power supply unit (battery charger) gets very hot. Kslov, in this model it is changed - a ferrite ring and a maximum current of 3A.
And on the one hand, the screen mount is weak - when you click on the edge a little "walks" by 0.5mm.
The camera compared to the Fire disgusting.