I am also using XOLO Q800 for some times now and in a single word, it is best sub 14K Phone. Regarding Chinese phone and about build quality, it is far better than any other Indian Phone makers like karbonn or Micromax. Ya, it has some software glitches but the main reason I have bought this phone is forum support and availability of huge number of Custom Roms. Currently I am using a ROM called Ultimate V1 based on JB 4.2.1 which comes with Sony Bravia Engine 3, HTC Beats Audio, Sony Walkman Audio Player with all its audio enhancement plugins, Acid Audio Mod and Dolby Mobile plugin. It also offers Engineering Mode where you can increase the maximum In-Call and Music volume if you feel it is low. The UI is extreme fast and with Nova launcher. It actually has a dedicated thread where you can get all the info about Rooting, custom Rom, installation guide and app recommendations. Check here: *www.androidjugaad.com/
Currently we are having two superb ROM, Nexus Edition and Samsung Galaxy S4 based one. The later is being considered as the best ROM which brings Samsung's Multi Window and Floating Video support in XOLO Q800. Check it yourselves.
Regarding Video Recording quality, use Snap Camera HDR which offers huge number of video settings like Video Codec type (MPEG4, H264, H263), Video Format type (3GP, .MP4), Video Bitrate, Audio Codec and Audio Bitrate, Video Resolution in (Width X Height) format, HDR configuration etc. I think you guys already know that it has two Microphones, one for calling and one specially designed for Voice recording with Video and can catch audio from longer distance. I have taken couple of 1080P video in a ceremony and in my Office and was stunned by the Video quality and the loudness and clarity of the recorded audio. And believe me, it is not easy to stun me that easily.