I have Time Warner, here in the San Fernando Valley (L.A., Ca.). I can still receive the analog cable channels without their digital box, but I think they give you a digital feed of the same programs if you use it.
If you're in a good reception area, the sound and pic for regular broadcast channles have always been worse than off the antenna. I think the pict and sound are even worse off the digital feed. At first, it may look a little shaper, but on some channels, they do so much data compression that I see these strange artifacts where the words from the sound don't come close to matching the picture. You can see this on "regular" cable, and even off the air, if the program is compressed by the broadcaster, but the cable guys seem to be doing more than their share of added destruction. :disgust: