Last night I exchanged my Cisco 8642 HD PVR for a new Samsung 4K Ultra HD PVR 10455HD, which I connected to an 8 year old Sony Bravia 55" TV. At first the image appeared to be brighter but after a closer look at peoples faces, it looked like the people had makeup smeared across their faces because there was very little variation in colour and density in the skin tones. Today I called Videotron tech support and they confirmed that there were no configuration errors in my PVR setup. I asked if Samsung used a different algorithm to convert the compressed data stream arriving via coax into HDMI 1080i delivered to the TV, versus the similar method used by Cisco, and no opinion was offered. I was told to go find another household with the same Ultra HD terminal connected to a non Ultra HD TV and see if the quality was the same. The Samsung is definitely faster stopping the live action when I press the pause button, but I am not sure if the Samsung is giving me the same definition that the older Cisco gave. Unfortunately I returned the Cisco on the same day I picked up the Samsung, so I can’t do a side by side A-B test to compare image quality. One would expect that an Ultra HD terminal could do a better job of passing 1080i content through it compared to a non Ultra HD terminal.