I'm always angry when I watch my parents' little 13" HDTV because of how good the SD video quality is. The 3D comb filter is just ridiculously effective, not only with LD but also with super-noisy analog cable signals (and the noise filter turned off). The only rainbows I saw last time I was there were on a black-and-white striped shirt, and they went away as soon as the character stopped moving.

They got this thing on sale for under $75, meanwhile there are $500 capture cards still made with 2D-only filters.