We originally ordered the light gray "Grommet Top Thermal Insulated 72-inch Blackout Curtain Panel Pair", here on Great Offer Stock (same company, same curtain, different color grommets,) but I didn't like the brass color of the grommets since the room has silver accents. I wanted a darker gray anyway - and these fit the bill perfectly! Great Offer Stock was great about doing the exchange and I had the new curtains before I had even shipped the others back!
The fabric is soft, lays nicely and does a wonderful job at blocking out the light. The home office is like a cave now! The grommets are large and slide nicely over the curtain rod, and appear to fastened well. I love that these came as a pair instead of single panels and that they come in 72" - which is a difficult length to find. Thankfully I finally the length I needed without having to sew my own curtains! I can't speak for the insulating factor of the curtains yet - we have only had them up for a few days and have had pleasant weather.
Unlike most blackout curtains - these aren't stiff, and they don't have a vinyl/rubber backing - it is just extremely thick material. I will say against a light gray wall, and in certain light the dark gray does appear to have a deep purple hue, but that's only at night with the overhead light on. Now I just have to hang the rest of the curtains, (Grommet Top Thermal Insulated 72-inch Blackout Curtain Panel Pair,) that we ordered for the rest of the house!