How much better is the pic/sound on superbit discs ? I watch through a Pioneer 656A into Sony KV32FQ75. Are they only really necessary for large plasma/rear pro screens ? I must admit, all the bonus features are a real buzz when you 1st get a disc, but once watched they seldom see the light of day, so if they are worth it, I think Superbits could be the way I choose. Opinions please.