Fabric quality and overall sewing were great.  However, the seams transitioning from black to white blocks were not finished and because it is a faux silk, the fabric unravels on the inside and you can see it through the curtain.  I think it would not survive washing.  Hold your curtains up to the window to ensure this isnt an issue.
customer service has been great and feel it was a defect and are sending a replacement pair.