When I initially switched from DN to Voom, I was able to do a side by side comparison of the SD channels--DN did not have HD back then (or I did not have them). The VOOM SD channels were somewhat inferior on my set (60" Sony LCD Projection) to DN's. When VOOM was dropped, I had Cox Cable (Alexandria, VA) and VOOM simultaneously and there was a world of difference in the quality of SD channels, cable was far superior to both VOOM AND DN on their digital lineup. Even some of the analog channels had a much better picture, sharper and brighter colors, albeit with some noise. There is variation on the cable channels, for example, the pay channels (HBO) and some of the digital channels (a handful), have an even better picture than the SD digital channels, of course not quite HD, but still very, very good. The satellite SD to my eyes have always been somewhat washed out due to high compression. Mind you, the 60" screen is also a major factor, this was really not noticeable at all on my old 27", so if you don't have this or larger screen size, not a factor. The reason I have been holding off is that I'm pretty sure I am going to see a degraded PQ on most of the channels, with the advantage of getting a larger number of HD channels (Cox only has a handful). But now, it seems that even the HD channels may not be up to snuff. If the so-called HD channels are not quite full HD, then maybe I need to think a bit more whether it is worth it to switch.