I have been using this phone for almost a year now.
The phone is very good without a doubt - the most prominent drawback being the battery life.
Camera is of very high quality and gives you wonderful shots, both front and back - clearly being the best feature of this phone.
Octacore processor is a bit disappointing as the performance while playing highend games is OK but not very smooth.
The stock features are nothing to brag about.(My previous phone was Samsung Note - II, and it had some awesome stock features).
But whatever the device offers works great. So overall a very good and sturdy handset from HTC.