I love grommet curtains and put up a new pair in our front window, but the curtain was thin and you couldn't see the design with the sun hitting it.  I hate having to attach or clip block out curtain liners on...this one is so simple!  They work great and you can't see them from the inside...very happy they worked just like they were shown!  

Pros: They're awesome!  Very simple to use.
Cons: A little pricey, but worth it!