HLN and TV Land seem overdue. And I would probably watch more Cooking Channel if it was in HD -- I tend to skip over it now.
I've watched some HD content from Cooking Channel from DirecTV's On Demand (ch. 1232). Everything looks great, and every bit as sharp as from regularly carried parent programmer Food Network HD.
I agree about the other two programmers. And right now I have on my TV a marathon of Bomb Girls episodes appearing on Reelz Channel. Everything from that programmer's HD content (ch. 1238) also looks great.