Ugh. Charter in my area has switched to SDV... after almost two years of a flawless TiVo, it is now a total disaster. I have two S-Cards that worked without issue, until the tuning adapter was hooked up... Now the card in slot one looses all digital channels about every 6 to 12 hours. (gives me just a gray screen) The card in slot 2 seems to always work for some reason. The only fix for this problem seems to be a re-boot. Starting last night, The TiVo won't show ANYTHING but a black screen.. has to unplug it-- it is back to "normal" now... I have also noticed an increase in macro-blocking since the switch to SDV. I have a tech scheduled to swap out the tuning adapter and S-Cards for an M-Card on Friday, but I don't have a lot of faith at this point. I don't know how widespread Charter's SDV is at this point, but if it is coming to your area, be ready for some fun new issues.