I, too, use them all the time. Sure saves $ not having to buy batting. I always check out the yard sales & thrift stores whenever I get a chance just for the mattress pads & covers. I also use blankets for batting. The only time I buy batting is when I make a quilt for a customer. With them paying for the quilt, I feel it should be the real thing. Besides, they are paying for it not me. LOL I would not open my door for the quilt police. There would be way to many violations. Anything goes with my quilts.