This looks so good in my living room, a perfect addition to the theme Im going for. 
These are very good at blocking the light, and I can only assume its helping the room keep its heat, because at times Ill walk by the window and put my hand next to it and I feel no chill coming from it, even on the freezing cold days weve been getting.
I will say, though, to pay attention to the details theyve put above. I didnt when I ordered this and assumed that 2 panels meant two blackout panels with the sheer covering attached to each, but what you get is one blackout panel and one sheer panel to layer. It even says it in the specifications, but (oops) I didnt read before I bought. My fault. So I ended up having to order another one, but I still think theyre worth the price for what they are.