I have both a Replay and Channel Master. The Replay is hooked up to cable via cable box. I am on "limited" meaning just the local broadcast stations. The Channel Master 7000 PAL is hooked up to an indoor antenna and I got nearly identical channels on both. My Samsung has HDMI so I can hook up the CM that way. The difference is astonishing between the Replay and CM when the channel is transmitting in HD. On Replay it looks washed out compared to full HD on the CM. In fact I prefer to use the CM to watch HD programs. But the Replay unit has the superior EPG as it is updated nightly. The CM gets its guide information from OTA TV Guide, which is not always accurate compared to Replay. I get extra stations on CM because I can pick up the extra HD broadcast channels not covered in my limited cable subscription. So the difference is pretty obvious: the CM has the better quality digital and my tv (a Samsung) has a digital tuner requiring no converter. I keep the Replay for two main reasons: 1) antenna reception is not always steady (weather etc), 2) The epg is superior to CM and costs nothing as well (TIVO charges monthly or pay upfront, new CM still uses OTA epg but you can pay extra for TV Guide nightly updates via broadband).