The good metal grommets instead of plastic found in many curtains, excellent off-White color and subtle woven texture, inexpensive enough to buy in bulk for a circa 1790s farmhouse with many, many windows that needed insulating curtains for cold weather. 
Cons even after ironing, the curtains look a bit rumpled, they definitely are NOT blackout curtains, though they do cut down a lot on the glaring lights from cars driving past.  The manufacturer has a major problem in quality control in application of the grommets at the top