Looks fairly good when hung, color (at least for the "rouge" that I ordered) is accurate to the picture, and the sheen in the material is definitely present but isn't so flashy as to be distracting in a room. 
While it is lined and does keep out light better than most normal curtains I wouldn't use it as the only way to keep light out of a room; the panels aren't semi-sheer but they definitely are not black-out, and do let some light through.