The quality of the curtains is nice.  However, I bought the curtains for a window that gets direct sunlight all day and so I was hoping for a little more insulation.  I did buy the white curtains, so I guess I was just expecting the curtains to defy the laws of physics.  If you are looking for more insulation or need to block out the sun, I would recommend going with a darker color.  I kept the curtains and plan to use them in place of a sheer curtain underneath darker curtains in order to provide double insulation.