HD downconverted is a mixed bag, at least for me. Network dramas/comedies/movies look great, very DVD like, but most sports are hard to watch this way. To much shimmering is the best way to explain it. Straight lines (on a tennis court, on a football field, etc) tend to shimmer or shake a bit. Must not be the greatest 480i conversion chip as I've seen other stand alone ATSC boxes that do much better 480i conversions with sports.