We just put up these curtains and so far I am very pleased with them.  The material seems heavy and nice quality.  They do a good job blacking out our very big windows.  My only con with these curtains is I would like them to have grommets for the curtain rods, instead of tabs.  Also, do be aware that the colors in the pictures aren't quite accurate; we ordered the "Jadeite" color, assuming it was a primarily blue curtain.  However, it is a primarily green color in person.  It is a really pretty green, though, so we decided to keep it.  But if you are looking for a straight-up blue, be advised that that's not what this color is.  

Pros: Heavy duty, good quality, darkening
Cons: Tabs instead of grommets