I would agree that there are things that can be used to do the job that Kwik Klip does so well, but for me, it's the pin covers that are irreplaceable.
I've tried to use the Kwik Klip on pins w/o the covers, and there's just no comparison. So much easier and faster with the covers. Also, I love to see my quilt covered in all those pretty rainbow colored bits when I'm done basting it!
