I think they are worth $20 but I bought the glasses when they were a daily deal at Missouri Star Quilt Co. The color film works but the glasses make it easier, both hands are free. I really like how I can see my whole quilt top when I have the blocks laid out to see contrast. Also I use a peep hole to look at my quilt top and I can see the whole quilt in black and white with the glasses on. They fit over my regular glasses and are very lightweight. I'm glad I bought them. I bought extra for some of my quilt buddies. I knew they would want to use mine when we go fabric shopping! They love them. We look a sight in a fabric store together.