These are GREAT!
The material is a good texture. Not too much sheen, yet still easy to clean.
They're the perfect shade of Lime Green.
The backing is thick enough that theres no green glow to the room!!
They are not going to perform as a blackout panel.  
They will block light, but because curtains remain inoperable (by definition), you should add another operable layer of blackout shade if you want a dark room.