Bought a new XL4 in January. Mid March started having major pixellation on numerous HD channels, some with total signal loss. It was intermittent and would effect different channels at different times, although there was a core of channels (707,709, 710) that were always unwatchable. Comcast (San Francisco) was out four times. Signal always tested OK. They replaced the cable from their terminal on roof to equipment, replaced the cable card. Finally connected cable that went to XL4 to old Series 3 in bedroom and the Series 3 had pixellation. Reversed connections and connected cable from bedroom Series 3 to XL4 in bedroom and it was fine. That seemed to eliminate the cable as the source of the problem. Must say that Comcast was very aggressive in trying to find the problem. Called Tivo and they sent replacement. Arrived today and to my surprise it was a refurbished Elite. I know the Elites became the XL4 about April, 2012. So basically I have a refurbished Tivo that is at least 1+ year old. Who knows how long it's been sitting around or why it's been sitting around so long. I actually thought I was going to get another XL4. I didn't realize they would replace with an old refurbished unit. My question is should I be concerned? Is this normal? I will be setting up tomorrow. I sure hope it works because I don't want to go through the replacement process again. Thanks for reading...I know I went on a bit long.