Few updates from my side:
Sound quality issues are sorted out and sound output is great now. DD 5.1 available in apps like Netflix.
Sometime you may see subscription check is failed message. It will go with in few seconds or you need to restart.
Channel addition is not automatic and will happen when you start STB. You may see channel addition message for few minutes on screen.
I use it as Chromecast very often and never got any issue in using it.
Also I am waiting for the feature of cloud recording and catchup tv which will be available soon on these boxes.