Dear folks, I just got videocon HD d2h installed on 3-8-2013. I am just sharing my experiences.
I had purchased Yamaha YHT-196 a month back. It is a good entry level Home Theatre. I already have a Sony 40 in Full HD TV. I was looking for a HD satellite provider and narrowed down on videocon as received many good reviews and supports many HD channels. The subscription rates are also less. But I was not sure whether I will received Dolby Digital sound on the HD channels. I searched many forums and this forum provided me with maximum insight. I called their customer support, and they informed me that DD is provided only through Coaxial SPDIF connector and not via HDMI port. Since Yamaha YHT-196 has two coaxial SPDIF ports and two Optical SPDIF ports I felt comfortable.
Finally went for the HD STB last Saturday. I also bought a coaxial SPDIF cable for connecting the STB with my Yamaha AVR. Videocon gave me only the black STB (not white one - which is more advanced). I connected the HDMI port and SPDIF port to Yamaha AVR and from AVR one HDMI cable to the TV. I selected the audio source as Coaxial port in the AVR. I got Dolby Digital in many HD channels. But later when I checked, I found that the STB supports Dolby Digital even through the HDMI port. So no SPDIF was necessary. That must be because of the latest firmware they loaded.
As Dolby Digital is provided only is few HD channels, I opted for Dolby Prologic II as the sound enhancement in the Yamaha AVR. When the input is in Dolby Digital, the AVR automatically switches to Dolby Digital mode and displays "Dolby Digital". Else it displays "DD Prologic II". The DD is very good in Engligh Movie channels. I could not get DD in many other channels although people mentioned that they are getting DD in colors HD, Life OK HD etc. I have to experiment and find out.