I've used them...with mixed feelings. I still want to pre shrink everything, and you really can't do that with charm packs. One store owner I talked to says that charms are the future of quilting, because everyone loves the puckered look when they're finally washed as a quilt. But that means your backing can't be preshrunk (is that a word?), and what if something isn't color fast even in COLD water? I guess I'm too old to change. I NEED to preshrink!