They are very pretty! Their prices look ok at first glance, but remember, it's 1/2 the amount of fabric in standard jelly rolls. You might do better price wise to watch for sales on other brands for the larger jelly rolls. I've seen some of those fabrics in Joann's and Walmart. Personally, I don't consider most of what I find at Joann's or Walmart to be quilt-shop quality.
This quote is from their website:
"All fabrics are 100% premium cotton. Fabric manufacturers include Marcus Brothers, Debbie Mumm, Legacy Studios, VIP/Cranston and Keepsake Calicos by Joann. All fabrics are hand-selected and are guaranteed to be quilt-shop quality."